Repository: SciTools/iris (language: python)

Issue:
Re-licensing iris from LGPL to BSD-3
To enable wider adoption of Iris, we are working on re-licensing it to be the more flexible BSD-3 license. 

Before we can do this we need all previous contributors to sign the latest SciTools Contributors License Agreement (CLA) as this includes a clause stating that the SciTools libraries can be re-licensed to any other OSI approved license. 

If your username appears below, could you please sign the updated CLA (Google Form) which can be found here: https://scitools.org.uk/cla/v4/form 

- [ ] @andreas-h
- [x] @ajdawson 
- [x] @mir06 
- [x] @cvelascof 
- [x] @cbcunc 
- [x] @duncanwp 
- [x] @jswanljung 
- [x] @philippjfr 
- [x] @SimonPeatman 
- [ ] @shoyer 
- [x] @bascrezee 

This form is also linked from the SciTools Governance page: https://scitools.org.uk/organisation.html#governance
 
Once all contributors listed above have signed the new CLA we will re-license Iris to BSD-3.
Re-licensing iris from LGPL to BSD-3
To enable wider adoption of Iris, we are working on re-licensing it to be the more flexible BSD-3 license. 

Before we can do this we need all previous contributors to sign the latest SciTools Contributors License Agreement (CLA) as this includes a clause stating that the SciTools libraries can be re-licensed to any other OSI approved license. 

If your username appears below, could you please sign the updated CLA (Google Form) which can be found here: https://scitools.org.uk/cla/v4/form 

- [ ] @andreas-h
- [x] @ajdawson 
- [x] @mir06 
- [x] @cvelascof 
- [x] @cbcunc 
- [x] @duncanwp 
- [x] @jswanljung 
- [x] @philippjfr 
- [x] @SimonPeatman 
- [ ] @shoyer 
- [x] @bascrezee 

This form is also linked from the SciTools Governance page: https://scitools.org.uk/organisation.html#governance
 
Once all contributors listed above have signed the new CLA we will re-license Iris to BSD-3.


Discussion / hints:
Signed.
Signed.
Done!
Signed. I only contributed a small feature 7 years ago and am no longer in the field, but contributing to iris was very enjoyable. Everyone was so friendly and supportive and the process was so well thought out. Thanks!6 feb. 2023 kl. 09:57 skrev lbdreyer ***@***.***>:﻿
To enable wider adoption of Iris, we are working on re-licensing it to be the more flexible BSD-3 license.
Before we can do this we need all previous contributors to sign the latest SciTools Contributors License Agreement (CLA) as this includes a clause stating that the SciTools libraries can be re-licensed to any other OSI approved license.
If your username appears below, could you please sign the updated CLA (Google Form) which can be found here: https://scitools.org.uk/cla/v4/form

 @andreas-h
 @ajdawson
 @mir06
 @cvelascof
 @cbcunc
 @duncanwp
 @jswanljung
 @philippjfr
 @SimonPeatman
 @shoyer
 @bascrezee

This form is also linked from the SciTools Governance page: https://scitools.org.uk/organisation.html#governance
Once all contributors listed above have signed the new CLA we will re-license Iris to BSD-3.

—Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you were mentioned.Message ID: ***@***.***>
I would be happy to sign in my personal capacity, but I believe I previously signed this form on behalf of my former employer (climate.com). Feel free to reach out to me directly at shoyer@gmail.com if this is the case and I can see I can help find someone to authorize this.
Signed. 
> I would be happy to sign in my personal capacity, but I believe I previously signed this form on behalf of my former employer (climate.com). Feel free to reach out to me directly at [shoyer@gmail.com](mailto:shoyer@gmail.com) if this is the case and I can see I can help find someone to authorize this.

Yes, I think your former employer may be considered as the first owner of the copyright at least for anything you contributed as part of your employment so it may make sense to get authorisation from them. I will contact to you directly to discuss this further
Important info regarding @andreas-h:

https://www.iup.uni-bremen.de/lamos/Andreas-Hilboll.html
We are very close to being able to move Iris to the BSD-3 license!

There are a couple of contributors that have not yet signed the new CLA, so I am going to retry contacting those that are outstanding.

The plan is to **relicense Iris after Monday 16th October 2023** so you have until that date to get in touch! If we have not heard from you before that date we will assume that you are happy with the change, and will proceed with the relicensing.

Note that, as BSD-3 is an open source license so moving Iris from LGPL to BSD-3 still meets the open source objectives all past contributors originally agreed to. Nonetheless, if you have any queries regarding the re-licensing please let me know before **Monday 16th October 2023**
Signed.
Signed.
Done!
Signed. I only contributed a small feature 7 years ago and am no longer in the field, but contributing to iris was very enjoyable. Everyone was so friendly and supportive and the process was so well thought out. Thanks!6 feb. 2023 kl. 09:57 skrev lbdreyer ***@***.***>:﻿
To enable wider adoption of Iris, we are working on re-licensing it to be the more flexible BSD-3 license.
Before we can do this we need all previous contributors to sign the latest SciTools Contributors License Agreement (CLA) as this includes a clause stating that the SciTools libraries can be re-licensed to any other OSI approved license.
If your username appears below, could you please sign the updated CLA (Google Form) which can be found here: https://scitools.org.uk/cla/v4/form

 @andreas-h
 @ajdawson
 @mir06
 @cvelascof
 @cbcunc
 @duncanwp
 @jswanljung
 @philippjfr
 @SimonPeatman
 @shoyer
 @bascrezee

This form is also linked from the SciTools Governance page: https://scitools.org.uk/organisation.html#governance
Once all contributors listed above have signed the new CLA we will re-license Iris to BSD-3.

—Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you were mentioned.Message ID: ***@***.***>
I would be happy to sign in my personal capacity, but I believe I previously signed this form on behalf of my former employer (climate.com). Feel free to reach out to me directly at shoyer@gmail.com if this is the case and I can see I can help find someone to authorize this.
Signed. 
> I would be happy to sign in my personal capacity, but I believe I previously signed this form on behalf of my former employer (climate.com). Feel free to reach out to me directly at [shoyer@gmail.com](mailto:shoyer@gmail.com) if this is the case and I can see I can help find someone to authorize this.

Yes, I think your former employer may be considered as the first owner of the copyright at least for anything you contributed as part of your employment so it may make sense to get authorisation from them. I will contact to you directly to discuss this further
Important info regarding @andreas-h:

https://www.iup.uni-bremen.de/lamos/Andreas-Hilboll.html
We are very close to being able to move Iris to the BSD-3 license!

There are a couple of contributors that have not yet signed the new CLA, so I am going to retry contacting those that are outstanding.

The plan is to **relicense Iris after Monday 16th October 2023** so you have until that date to get in touch! If we have not heard from you before that date we will assume that you are happy with the change, and will proceed with the relicensing.

Note that, as BSD-3 is an open source license so moving Iris from LGPL to BSD-3 still meets the open source objectives all past contributors originally agreed to. Nonetheless, if you have any queries regarding the re-licensing please let me know before **Monday 16th October 2023**

Fix patch:
diff --git a/COPYING b/COPYING
deleted file mode 100644
index 94a9ed024d..0000000000
--- a/COPYING
+++ /dev/null
@@ -1,674 +0,0 @@
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-License would be to refrain entirely from conveying the Program.
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-  13. Use with the GNU Affero General Public License.
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-  17. Interpretation of Sections 15 and 16.
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-                     END OF TERMS AND CONDITIONS
-
-            How to Apply These Terms to Your New Programs
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-    This program is distributed in the hope that it will be useful,
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-
-Also add information on how to contact you by electronic and paper mail.
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-  If the program does terminal interaction, make it output a short
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-    <program>  Copyright (C) <year>  <name of author>
-    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
-    This is free software, and you are welcome to redistribute it
-    under certain conditions; type `show c' for details.
-
-The hypothetical commands `show w' and `show c' should show the appropriate
-parts of the General Public License.  Of course, your program's commands
-might be different; for a GUI interface, you would use an "about box".
-
-  You should also get your employer (if you work as a programmer) or school,
-if any, to sign a "copyright disclaimer" for the program, if necessary.
-For more information on this, and how to apply and follow the GNU GPL, see
-<http://www.gnu.org/licenses/>.
-
-  The GNU General Public License does not permit incorporating your program
-into proprietary programs.  If your program is a subroutine library, you
-may consider it more useful to permit linking proprietary applications with
-the library.  If this is what you want to do, use the GNU Lesser General
-Public License instead of this License.  But first, please read
-<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/COPYING.LESSER b/COPYING.LESSER
deleted file mode 100644
index 65c5ca88a6..0000000000
--- a/COPYING.LESSER
+++ /dev/null
@@ -1,165 +0,0 @@
-                   GNU LESSER GENERAL PUBLIC LICENSE
-                       Version 3, 29 June 2007
-
- Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
-
-  This version of the GNU Lesser General Public License incorporates
-the terms and conditions of version 3 of the GNU General Public
-License, supplemented by the additional permissions listed below.
-
-  0. Additional Definitions.
-
-  As used herein, "this License" refers to version 3 of the GNU Lesser
-General Public License, and the "GNU GPL" refers to version 3 of the GNU
-General Public License.
-
-  "The Library" refers to a covered work governed by this License,
-other than an Application or a Combined Work as defined below.
-
-  An "Application" is any work that makes use of an interface provided
-by the Library, but which is not otherwise based on the Library.
-Defining a subclass of a class defined by the Library is deemed a mode
-of using an interface provided by the Library.
-
-  A "Combined Work" is a work produced by combining or linking an
-Application with the Library.  The particular version of the Library
-with which the Combined Work was made is also called the "Linked
-Version".
-
-  The "Minimal Corresponding Source" for a Combined Work means the
-Corresponding Source for the Combined Work, excluding any source code
-for portions of the Combined Work that, considered in isolation, are
-based on the Application, and not on the Linked Version.
-
-  The "Corresponding Application Code" for a Combined Work means the
-object code and/or source code for the Application, including any data
-and utility programs needed for reproducing the Combined Work from the
-Application, but excluding the System Libraries of the Combined Work.
-
-  1. Exception to Section 3 of the GNU GPL.
-
-  You may convey a covered work under sections 3 and 4 of this License
-without being bound by section 3 of the GNU GPL.
-
-  2. Conveying Modified Versions.
-
-  If you modify a copy of the Library, and, in your modifications, a
-facility refers to a function or data to be supplied by an Application
-that uses the facility (other than as an argument passed when the
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-   function or data, the facility still operates, and performs
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-   b) under the GNU GPL, with none of the additional permissions of
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-  3. Object Code Incorporating Material from Library Header Files.
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-(ten or fewer lines in length), you do both of the following:
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-   a) Give prominent notice with each copy of the object code that the
-   Library is used in it and that the Library and its use are
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-   Information in the manner specified by section 6 of the GNU GPL
-   for conveying Corresponding Source.)
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-Library side by side in a single library together with other library
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-   a) Accompany the combined library with a copy of the same work based
-   on the Library, uncombined with any other library facilities,
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-   b) Give prominent notice with the combined library that part of it
-   is a work based on the Library, and explaining where to find the
-   accompanying uncombined form of the same work.
-
-  6. Revised Versions of the GNU Lesser General Public License.
-
-  The Free Software Foundation may publish revised and/or new versions
-of the GNU Lesser General Public License from time to time. Such new
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-differ in detail to address new problems or concerns.
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-Library as you received it specifies that a certain numbered version
-of the GNU Lesser General Public License "or any later version"
-applies to it, you have the option of following the terms and
-conditions either of that published version or of any later version
-published by the Free Software Foundation. If the Library as you
-received it does not specify a version number of the GNU Lesser
-General Public License, you may choose any version of the GNU Lesser
-General Public License ever published by the Free Software Foundation.
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-  If the Library as you received it specifies that a proxy can decide
-whether future versions of the GNU Lesser General Public License shall
-apply, that proxy's public statement of acceptance of any version is
-permanent authorization for you to choose that version for the
-Library.
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000000..2d1d23e16c
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,29 @@
+BSD 3-Clause License
+
+Copyright (c) 2010, Met Office.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/MANIFEST.in b/MANIFEST.in
index 329cf79c5d..354b92d735 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -17,8 +17,7 @@ exclude .readthedocs.yml
 exclude CHANGES
 exclude CODE_OF_CONDUCT.md
 exclude codecov.yml
-include COPYING
-include COPYING.LESSER
+include LICENSE
 exclude Makefile
 exclude noxfile.py
 
diff --git a/README.md b/README.md
index 53d24b0162..f857608718 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@
 | 💬 Community     | [![Contributor Covenant](https://img.shields.io/badge/contributor%20covenant-2.1-4baaaa.svg)](https://www.contributor-covenant.org/version/2/1/code_of_conduct/) [![GH Discussions](https://img.shields.io/badge/github-discussions%20%F0%9F%92%AC-yellow?logo=github&logoColor=lightgrey)](https://github.com/SciTools/iris/discussions) [![twitter](https://img.shields.io/twitter/follow/scitools_iris?color=yellow&label=twitter%7Cscitools_iris&logo=twitter&style=plastic)](https://twitter.com/scitools_iris)                                                                                                                         |
 | 📖 Documentation | [![rtd](https://readthedocs.org/projects/scitools-iris/badge/?version=latest)](https://scitools-iris.readthedocs.io/en/latest/?badge=latest)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
 | 📈 Health        | [![codecov](https://codecov.io/gh/SciTools/iris/branch/main/graph/badge.svg?token=0GeICSIF3g)](https://codecov.io/gh/SciTools/iris)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
-| ✨ Meta           | [![code style - black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black) [![NEP29](https://raster.shields.io/badge/follows-NEP29-orange.png)](https://numpy.org/neps/nep-0029-deprecation_policy.html) [![license - bds-3-clause](https://img.shields.io/github/license/SciTools/iris)](https://github.com/SciTools/iris/blob/main/COPYING.LESSER) [![conda platform](https://img.shields.io/conda/pn/conda-forge/iris.svg)](https://anaconda.org/conda-forge/iris)                                                                                                                                 |
+| ✨ Meta           | [![code style - black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black) [![NEP29](https://raster.shields.io/badge/follows-NEP29-orange.png)](https://numpy.org/neps/nep-0029-deprecation_policy.html) [![license - bds-3-clause](https://img.shields.io/github/license/SciTools/iris)](https://github.com/SciTools/iris/blob/main/LICENSE) [![conda platform](https://img.shields.io/conda/pn/conda-forge/iris.svg)](https://anaconda.org/conda-forge/iris)                                                                                                                                 |
 | 📦 Package       | [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.595182.svg)](https://doi.org/10.5281/zenodo.595182) [![conda-forge](https://img.shields.io/conda/vn/conda-forge/iris?color=orange&label=conda-forge&logo=conda-forge&logoColor=white)](https://anaconda.org/conda-forge/iris) [![pypi](https://img.shields.io/pypi/v/scitools-iris?color=orange&label=pypi&logo=python&logoColor=white)](https://pypi.org/project/scitools-iris/) [![pypi - python version](https://img.shields.io/pypi/pyversions/scitools-iris.svg?color=orange&logo=python&label=python&logoColor=white)](https://pypi.org/project/scitools-iris/)                    |
 | 🧰 Repo          | [![commits-since](https://img.shields.io/github/commits-since/SciTools/iris/latest.svg)](https://github.com/SciTools/iris/commits/main) [![contributors](https://img.shields.io/github/contributors/SciTools/iris)](https://github.com/SciTools/iris/graphs/contributors) [![release](https://img.shields.io/github/v/release/scitools/iris)](https://github.com/SciTools/iris/releases)                                                                                                                                                                                                                                                     |
 |                  |
diff --git a/benchmarks/asv_delegated_conda.py b/benchmarks/asv_delegated_conda.py
index 22a3110075..a60cb7f2b7 100644
--- a/benchmarks/asv_delegated_conda.py
+++ b/benchmarks/asv_delegated_conda.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 ASV plug-in providing an alternative :class:`asv.plugins.conda.Conda`
 subclass that manages the Conda environment via custom user scripts.
diff --git a/benchmarks/benchmarks/__init__.py b/benchmarks/benchmarks/__init__.py
index c86682ca4a..61983a969f 100644
--- a/benchmarks/benchmarks/__init__.py
+++ b/benchmarks/benchmarks/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Common code for benchmarks."""
 from os import environ
 import resource
diff --git a/benchmarks/benchmarks/aux_factory.py b/benchmarks/benchmarks/aux_factory.py
index 4cc4f6c70a..7d1e266c78 100644
--- a/benchmarks/benchmarks/aux_factory.py
+++ b/benchmarks/benchmarks/aux_factory.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 AuxFactory benchmark tests.
 
diff --git a/benchmarks/benchmarks/coords.py b/benchmarks/benchmarks/coords.py
index 3107dcf077..b6f56b997f 100644
--- a/benchmarks/benchmarks/coords.py
+++ b/benchmarks/benchmarks/coords.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Coord benchmark tests.
 
diff --git a/benchmarks/benchmarks/cperf/__init__.py b/benchmarks/benchmarks/cperf/__init__.py
index 814d29338f..7adba01b60 100644
--- a/benchmarks/benchmarks/cperf/__init__.py
+++ b/benchmarks/benchmarks/cperf/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Benchmarks for the CPerf scheme of the UK Met Office's NG-VAT project.
 
diff --git a/benchmarks/benchmarks/cperf/equality.py b/benchmarks/benchmarks/cperf/equality.py
index 47eb255513..f27558a5ed 100644
--- a/benchmarks/benchmarks/cperf/equality.py
+++ b/benchmarks/benchmarks/cperf/equality.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Equality benchmarks for the CPerf scheme of the UK Met Office's NG-VAT project.
 """
diff --git a/benchmarks/benchmarks/cperf/load.py b/benchmarks/benchmarks/cperf/load.py
index 04bb7e1a61..efbd497e2e 100644
--- a/benchmarks/benchmarks/cperf/load.py
+++ b/benchmarks/benchmarks/cperf/load.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 File loading benchmarks for the CPerf scheme of the UK Met Office's NG-VAT project.
 """
diff --git a/benchmarks/benchmarks/cperf/save.py b/benchmarks/benchmarks/cperf/save.py
index 2eb60e2ab5..957b28e3fd 100644
--- a/benchmarks/benchmarks/cperf/save.py
+++ b/benchmarks/benchmarks/cperf/save.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 File saving benchmarks for the CPerf scheme of the UK Met Office's NG-VAT project.
 """
diff --git a/benchmarks/benchmarks/cube.py b/benchmarks/benchmarks/cube.py
index 5889ce872b..ceacb4e86c 100644
--- a/benchmarks/benchmarks/cube.py
+++ b/benchmarks/benchmarks/cube.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Cube benchmark tests.
 
diff --git a/benchmarks/benchmarks/experimental/__init__.py b/benchmarks/benchmarks/experimental/__init__.py
index f16e400bce..81fb222916 100644
--- a/benchmarks/benchmarks/experimental/__init__.py
+++ b/benchmarks/benchmarks/experimental/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Benchmark tests for the experimental module.
 
diff --git a/benchmarks/benchmarks/experimental/ugrid/__init__.py b/benchmarks/benchmarks/experimental/ugrid/__init__.py
index 2e40c525a6..1fa8b82d67 100644
--- a/benchmarks/benchmarks/experimental/ugrid/__init__.py
+++ b/benchmarks/benchmarks/experimental/ugrid/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Benchmark tests for the experimental.ugrid module.
 
diff --git a/benchmarks/benchmarks/experimental/ugrid/regions_combine.py b/benchmarks/benchmarks/experimental/ugrid/regions_combine.py
index 5ecc90930b..6d62cf9cd5 100644
--- a/benchmarks/benchmarks/experimental/ugrid/regions_combine.py
+++ b/benchmarks/benchmarks/experimental/ugrid/regions_combine.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Benchmarks stages of operation of the function
 :func:`iris.experimental.ugrid.utils.recombine_submeshes`.
diff --git a/benchmarks/benchmarks/generate_data/__init__.py b/benchmarks/benchmarks/generate_data/__init__.py
index 52a5aceca8..8837e7cca9 100644
--- a/benchmarks/benchmarks/generate_data/__init__.py
+++ b/benchmarks/benchmarks/generate_data/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Scripts for generating supporting data for benchmarking.
 
diff --git a/benchmarks/benchmarks/generate_data/stock.py b/benchmarks/benchmarks/generate_data/stock.py
index 954e791f43..b6702ad883 100644
--- a/benchmarks/benchmarks/generate_data/stock.py
+++ b/benchmarks/benchmarks/generate_data/stock.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Wrappers for using :mod:`iris.tests.stock` methods for benchmarking.
 
diff --git a/benchmarks/benchmarks/generate_data/ugrid.py b/benchmarks/benchmarks/generate_data/ugrid.py
index 527b49a6bb..3be5c20a48 100644
--- a/benchmarks/benchmarks/generate_data/ugrid.py
+++ b/benchmarks/benchmarks/generate_data/ugrid.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Scripts for generating supporting data for UGRID-related benchmarking.
 """
diff --git a/benchmarks/benchmarks/generate_data/um_files.py b/benchmarks/benchmarks/generate_data/um_files.py
index 39773bbb4b..23d3770aa1 100644
--- a/benchmarks/benchmarks/generate_data/um_files.py
+++ b/benchmarks/benchmarks/generate_data/um_files.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Generate FF, PP and NetCDF files based on a minimal synthetic FF file.
 
diff --git a/benchmarks/benchmarks/import_iris.py b/benchmarks/benchmarks/import_iris.py
index fc32ac289b..5f902fd2e0 100644
--- a/benchmarks/benchmarks/import_iris.py
+++ b/benchmarks/benchmarks/import_iris.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 from importlib import import_module, reload
 
 ################
diff --git a/benchmarks/benchmarks/iterate.py b/benchmarks/benchmarks/iterate.py
index 0a5415ac2b..6cc935498c 100644
--- a/benchmarks/benchmarks/iterate.py
+++ b/benchmarks/benchmarks/iterate.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Iterate benchmark tests.
 
diff --git a/benchmarks/benchmarks/load/__init__.py b/benchmarks/benchmarks/load/__init__.py
index 3d15629f9e..a926e6b7e2 100644
--- a/benchmarks/benchmarks/load/__init__.py
+++ b/benchmarks/benchmarks/load/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 File loading benchmark tests.
 
diff --git a/benchmarks/benchmarks/load/ugrid.py b/benchmarks/benchmarks/load/ugrid.py
index 35c8754171..ef01ae03be 100644
--- a/benchmarks/benchmarks/load/ugrid.py
+++ b/benchmarks/benchmarks/load/ugrid.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Mesh data loading benchmark tests.
 
diff --git a/benchmarks/benchmarks/metadata_manager_factory.py b/benchmarks/benchmarks/metadata_manager_factory.py
index 7e7fc98008..531af58b66 100644
--- a/benchmarks/benchmarks/metadata_manager_factory.py
+++ b/benchmarks/benchmarks/metadata_manager_factory.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 metadata_manager_factory benchmark tests.
 
diff --git a/benchmarks/benchmarks/mixin.py b/benchmarks/benchmarks/mixin.py
index bec5518eee..335bee1a0f 100644
--- a/benchmarks/benchmarks/mixin.py
+++ b/benchmarks/benchmarks/mixin.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Mixin benchmark tests.
 
diff --git a/benchmarks/benchmarks/plot.py b/benchmarks/benchmarks/plot.py
index 75195c86e9..73a2a51990 100644
--- a/benchmarks/benchmarks/plot.py
+++ b/benchmarks/benchmarks/plot.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Plot benchmark tests.
 
diff --git a/benchmarks/benchmarks/regridding.py b/benchmarks/benchmarks/regridding.py
index 44bd1b6c95..9cd77527af 100644
--- a/benchmarks/benchmarks/regridding.py
+++ b/benchmarks/benchmarks/regridding.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Regridding benchmark test
 
diff --git a/benchmarks/benchmarks/save.py b/benchmarks/benchmarks/save.py
index e9a7918dcc..6feb446c70 100644
--- a/benchmarks/benchmarks/save.py
+++ b/benchmarks/benchmarks/save.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 File saving benchmarks.
 
diff --git a/benchmarks/benchmarks/sperf/__init__.py b/benchmarks/benchmarks/sperf/__init__.py
index eccad56f6f..111cd4b841 100644
--- a/benchmarks/benchmarks/sperf/__init__.py
+++ b/benchmarks/benchmarks/sperf/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Benchmarks for the SPerf scheme of the UK Met Office's NG-VAT project.
 
diff --git a/benchmarks/benchmarks/sperf/combine_regions.py b/benchmarks/benchmarks/sperf/combine_regions.py
index e27b3b1996..da0cffde50 100644
--- a/benchmarks/benchmarks/sperf/combine_regions.py
+++ b/benchmarks/benchmarks/sperf/combine_regions.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Region combine benchmarks for the SPerf scheme of the UK Met Office's NG-VAT project.
 """
diff --git a/benchmarks/benchmarks/sperf/equality.py b/benchmarks/benchmarks/sperf/equality.py
index 85c73ab92b..bb3b707a75 100644
--- a/benchmarks/benchmarks/sperf/equality.py
+++ b/benchmarks/benchmarks/sperf/equality.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Equality benchmarks for the SPerf scheme of the UK Met Office's NG-VAT project.
 """
diff --git a/benchmarks/benchmarks/sperf/load.py b/benchmarks/benchmarks/sperf/load.py
index 6a60355976..ab1273e288 100644
--- a/benchmarks/benchmarks/sperf/load.py
+++ b/benchmarks/benchmarks/sperf/load.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 File loading benchmarks for the SPerf scheme of the UK Met Office's NG-VAT project.
 """
diff --git a/benchmarks/benchmarks/sperf/save.py b/benchmarks/benchmarks/sperf/save.py
index dd33924c6c..9892f0d239 100644
--- a/benchmarks/benchmarks/sperf/save.py
+++ b/benchmarks/benchmarks/sperf/save.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 File saving benchmarks for the SPerf scheme of the UK Met Office's NG-VAT project.
 """
diff --git a/benchmarks/benchmarks/trajectory.py b/benchmarks/benchmarks/trajectory.py
index 5c1d10d218..e4c3297614 100644
--- a/benchmarks/benchmarks/trajectory.py
+++ b/benchmarks/benchmarks/trajectory.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Trajectory benchmark test
 
diff --git a/benchmarks/bm_runner.py b/benchmarks/bm_runner.py
index 4b8f6e1f18..1efe8d3acb 100644
--- a/benchmarks/bm_runner.py
+++ b/benchmarks/bm_runner.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Argparse conveniences for executing common types of benchmark runs.
 """
diff --git a/docs/src/conf.py b/docs/src/conf.py
index 8be34c1989..e349000862 100644
--- a/docs/src/conf.py
+++ b/docs/src/conf.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # -*- coding: utf-8 -*-
 #
diff --git a/docs/src/copyright.rst b/docs/src/copyright.rst
index 2829374f47..d5996fd999 100644
--- a/docs/src/copyright.rst
+++ b/docs/src/copyright.rst
@@ -6,18 +6,15 @@ Iris Code
 ---------
 
 All Iris source code, unless explicitly stated, is ``Copyright Iris
-contributors`` and is licensed under the **GNU Lesser General Public
-License** as published by the Free Software Foundation, either version 3 of
-the License, or (at your option) any later version.
+contributors`` and is licensed under the **BSD-3 License**.
 You should find all source files with the following header:
 
 .. admonition:: Code License
 
     Copyright Iris contributors
 
-    This file is part of Iris and is released under the LGPL license.
-    See COPYING and COPYING.LESSER in the root of the repository for full
-    licensing details.
+    This file is part of Iris and is released under the BSD license.
+    See LICENSE in the root of the repository for full licensing details.
 
 
 Iris Documentation and Examples
diff --git a/docs/src/further_topics/filtering_warnings.rst b/docs/src/further_topics/filtering_warnings.rst
index 2cbad525d3..a69247008a 100644
--- a/docs/src/further_topics/filtering_warnings.rst
+++ b/docs/src/further_topics/filtering_warnings.rst
@@ -47,9 +47,9 @@ Warnings:
 
     >>> my_operation()
     ...
-    iris/coord_systems.py:456: IrisUserWarning: Setting inverse_flattening does not affect other properties of the GeogCS object. To change other properties set them explicitly or create a new GeogCS instance.
+    iris/coord_systems.py:455: IrisUserWarning: Setting inverse_flattening does not affect other properties of the GeogCS object. To change other properties set them explicitly or create a new GeogCS instance.
       warnings.warn(wmsg, category=iris.exceptions.IrisUserWarning)
-    iris/coord_systems.py:823: IrisDefaultingWarning: Discarding false_easting and false_northing that are not used by Cartopy.
+    iris/coord_systems.py:822: IrisDefaultingWarning: Discarding false_easting and false_northing that are not used by Cartopy.
       warnings.warn(
 
 Warnings can be suppressed using the Python warnings filter with the ``ignore``
@@ -110,7 +110,7 @@ You can target specific Warning messages, e.g.
     ...     warnings.filterwarnings("ignore", message="Discarding false_easting")
     ...     my_operation()
     ...
-    iris/coord_systems.py:456: IrisUserWarning: Setting inverse_flattening does not affect other properties of the GeogCS object. To change other properties set them explicitly or create a new GeogCS instance.
+    iris/coord_systems.py:455: IrisUserWarning: Setting inverse_flattening does not affect other properties of the GeogCS object. To change other properties set them explicitly or create a new GeogCS instance.
       warnings.warn(wmsg, category=iris.exceptions.IrisUserWarning)
 
 ::
@@ -125,16 +125,16 @@ Or you can target Warnings raised by specific lines of specific modules, e.g.
 .. doctest:: filtering_warnings
 
     >>> with warnings.catch_warnings():
-    ...     warnings.filterwarnings("ignore", module="iris.coord_systems", lineno=456)
+    ...     warnings.filterwarnings("ignore", module="iris.coord_systems", lineno=455)
     ...     my_operation()
     ...
-    iris/coord_systems.py:823: IrisDefaultingWarning: Discarding false_easting and false_northing that are not used by Cartopy.
+    iris/coord_systems.py:822: IrisDefaultingWarning: Discarding false_easting and false_northing that are not used by Cartopy.
       warnings.warn(
 
 ::
 
-    python -W ignore:::iris.coord_systems:454
-    export PYTHONWARNINGS=ignore:::iris.coord_systems:454
+    python -W ignore:::iris.coord_systems:453
+    export PYTHONWARNINGS=ignore:::iris.coord_systems:453
 
 Warnings from a Common Source
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -188,7 +188,7 @@ module during execution:
     ...     )
     ...     my_operation()
     ...
-    iris/coord_systems.py:456: IrisUserWarning: Setting inverse_flattening does not affect other properties of the GeogCS object. To change other properties set them explicitly or create a new GeogCS instance.
+    iris/coord_systems.py:455: IrisUserWarning: Setting inverse_flattening does not affect other properties of the GeogCS object. To change other properties set them explicitly or create a new GeogCS instance.
       warnings.warn(wmsg, category=iris.exceptions.IrisUserWarning)
 
 ----
diff --git a/docs/src/sphinxext/api_rst_formatting.py b/docs/src/sphinxext/api_rst_formatting.py
index 8f1aa3c5f3..6dd82de91e 100644
--- a/docs/src/sphinxext/api_rst_formatting.py
+++ b/docs/src/sphinxext/api_rst_formatting.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # This script will process all .rst files that have been created by
 # sphinxcontrib.apidoc extension and perform minor changes, specifically:
diff --git a/lib/iris/__init__.py b/lib/iris/__init__.py
index 2a3bd8a753..c29998cd6d 100644
--- a/lib/iris/__init__.py
+++ b/lib/iris/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 A package for handling multi-dimensional data and associated metadata.
 
diff --git a/lib/iris/_concatenate.py b/lib/iris/_concatenate.py
index 837afd73f3..554f14d914 100644
--- a/lib/iris/_concatenate.py
+++ b/lib/iris/_concatenate.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Automatic concatenation of multiple cubes over one or more existing dimensions.
 
diff --git a/lib/iris/_constraints.py b/lib/iris/_constraints.py
index 1884cbcbd9..82225ec516 100644
--- a/lib/iris/_constraints.py
+++ b/lib/iris/_constraints.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Provides objects for building up expressions useful for pattern matching.
 
diff --git a/lib/iris/_data_manager.py b/lib/iris/_data_manager.py
index 486a58de45..9ea4481307 100644
--- a/lib/iris/_data_manager.py
+++ b/lib/iris/_data_manager.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Management of common state and behaviour for cube and coordinate data.
 
diff --git a/lib/iris/_deprecation.py b/lib/iris/_deprecation.py
index 027e11f2dc..ad4dc5a560 100644
--- a/lib/iris/_deprecation.py
+++ b/lib/iris/_deprecation.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Utilities for producing runtime deprecation messages.
 
diff --git a/lib/iris/_lazy_data.py b/lib/iris/_lazy_data.py
index 4c294a7d2f..fb29f411d3 100644
--- a/lib/iris/_lazy_data.py
+++ b/lib/iris/_lazy_data.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Routines for lazy data handling.
 
diff --git a/lib/iris/_merge.py b/lib/iris/_merge.py
index 0f748d6d34..bf22f57887 100644
--- a/lib/iris/_merge.py
+++ b/lib/iris/_merge.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Automatic collation of cubes into higher-dimensional cubes.
 
diff --git a/lib/iris/_representation/__init__.py b/lib/iris/_representation/__init__.py
index f6c7fdf9b4..aec46ec927 100644
--- a/lib/iris/_representation/__init__.py
+++ b/lib/iris/_representation/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Code to make printouts and other representations (e.g. html) of Iris objects.
 
diff --git a/lib/iris/_representation/cube_printout.py b/lib/iris/_representation/cube_printout.py
index ea32fc5126..9239c96949 100644
--- a/lib/iris/_representation/cube_printout.py
+++ b/lib/iris/_representation/cube_printout.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Provides text printouts of Iris cubes.
 
diff --git a/lib/iris/_representation/cube_summary.py b/lib/iris/_representation/cube_summary.py
index 4e0fcfb1ea..1094588fa6 100644
--- a/lib/iris/_representation/cube_summary.py
+++ b/lib/iris/_representation/cube_summary.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Provides objects describing cube summaries.
 """
diff --git a/lib/iris/analysis/__init__.py b/lib/iris/analysis/__init__.py
index f00c3dd850..76dd52de6e 100644
--- a/lib/iris/analysis/__init__.py
+++ b/lib/iris/analysis/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 A package providing :class:`iris.cube.Cube` analysis support.
 
diff --git a/lib/iris/analysis/_area_weighted.py b/lib/iris/analysis/_area_weighted.py
index edead3948a..ffec82fd4e 100644
--- a/lib/iris/analysis/_area_weighted.py
+++ b/lib/iris/analysis/_area_weighted.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 import functools
 
 import cf_units
diff --git a/lib/iris/analysis/_grid_angles.py b/lib/iris/analysis/_grid_angles.py
index 4cb449ae51..86a0c38086 100644
--- a/lib/iris/analysis/_grid_angles.py
+++ b/lib/iris/analysis/_grid_angles.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Code to implement vector rotation by angles, and inferring gridcell angles
 from coordinate points and bounds.
diff --git a/lib/iris/analysis/_interpolation.py b/lib/iris/analysis/_interpolation.py
index 34dcae3026..091d29d7e2 100644
--- a/lib/iris/analysis/_interpolation.py
+++ b/lib/iris/analysis/_interpolation.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """A collection of helpers for interpolation."""
 
 from collections import namedtuple
diff --git a/lib/iris/analysis/_regrid.py b/lib/iris/analysis/_regrid.py
index 65679cd968..113c21e6e3 100644
--- a/lib/iris/analysis/_regrid.py
+++ b/lib/iris/analysis/_regrid.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 import copy
 import functools
diff --git a/lib/iris/analysis/calculus.py b/lib/iris/analysis/calculus.py
index 44b1adc580..f312aa02a0 100644
--- a/lib/iris/analysis/calculus.py
+++ b/lib/iris/analysis/calculus.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Calculus operations on :class:`iris.cube.Cube` instances.
 
diff --git a/lib/iris/analysis/cartography.py b/lib/iris/analysis/cartography.py
index 0fae5bc499..a760f5ab50 100644
--- a/lib/iris/analysis/cartography.py
+++ b/lib/iris/analysis/cartography.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Various utilities and numeric transformations relevant to cartography.
 
diff --git a/lib/iris/analysis/geometry.py b/lib/iris/analysis/geometry.py
index 9898f4e974..d7ed7f8840 100644
--- a/lib/iris/analysis/geometry.py
+++ b/lib/iris/analysis/geometry.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Various utilities related to geometric operations.
 
diff --git a/lib/iris/analysis/maths.py b/lib/iris/analysis/maths.py
index 5e180c6ee2..a24203ba2a 100644
--- a/lib/iris/analysis/maths.py
+++ b/lib/iris/analysis/maths.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Basic mathematical and statistical operations.
 
diff --git a/lib/iris/analysis/stats.py b/lib/iris/analysis/stats.py
index 711e3c5bfb..121d862adb 100644
--- a/lib/iris/analysis/stats.py
+++ b/lib/iris/analysis/stats.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Statistical operations between cubes.
 
diff --git a/lib/iris/analysis/trajectory.py b/lib/iris/analysis/trajectory.py
index 2495ff12fc..99c8add123 100644
--- a/lib/iris/analysis/trajectory.py
+++ b/lib/iris/analysis/trajectory.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Defines a Trajectory class, and a routine to extract a sub-cube along a
 trajectory.
diff --git a/lib/iris/aux_factory.py b/lib/iris/aux_factory.py
index 323c89e3fb..61855f1188 100644
--- a/lib/iris/aux_factory.py
+++ b/lib/iris/aux_factory.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Definitions of derived coordinates.
 
diff --git a/lib/iris/common/__init__.py b/lib/iris/common/__init__.py
index d8e8ba80ef..8526c549c3 100644
--- a/lib/iris/common/__init__.py
+++ b/lib/iris/common/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 A package for provisioning common Iris infrastructure.
 
diff --git a/lib/iris/common/lenient.py b/lib/iris/common/lenient.py
index 7c530087af..43dc09d5db 100644
--- a/lib/iris/common/lenient.py
+++ b/lib/iris/common/lenient.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Provides the infrastructure to support lenient client/service behaviour.
 
diff --git a/lib/iris/common/metadata.py b/lib/iris/common/metadata.py
index 7def79f51e..8d60171331 100644
--- a/lib/iris/common/metadata.py
+++ b/lib/iris/common/metadata.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Provides the infrastructure to support the common metadata API.
 
diff --git a/lib/iris/common/mixin.py b/lib/iris/common/mixin.py
index 4c19dd756b..f3b42fc02d 100644
--- a/lib/iris/common/mixin.py
+++ b/lib/iris/common/mixin.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Provides common metadata mixin behaviour.
 
diff --git a/lib/iris/common/resolve.py b/lib/iris/common/resolve.py
index 8d5d57d4a4..83ca630353 100644
--- a/lib/iris/common/resolve.py
+++ b/lib/iris/common/resolve.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Provides the infrastructure to support the analysis, identification and
 combination of metadata common between two :class:`~iris.cube.Cube`
diff --git a/lib/iris/config.py b/lib/iris/config.py
index 03d3d363a6..c1d1de5793 100644
--- a/lib/iris/config.py
+++ b/lib/iris/config.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Provides access to Iris-specific configuration values.
 
diff --git a/lib/iris/coord_categorisation.py b/lib/iris/coord_categorisation.py
index b6cc79f253..87103bf6f1 100644
--- a/lib/iris/coord_categorisation.py
+++ b/lib/iris/coord_categorisation.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Cube functions for coordinate categorisation.
 
diff --git a/lib/iris/coord_systems.py b/lib/iris/coord_systems.py
index 3d986fefce..e62f3fbf0e 100644
--- a/lib/iris/coord_systems.py
+++ b/lib/iris/coord_systems.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Definitions of coordinate systems.
 
diff --git a/lib/iris/coords.py b/lib/iris/coords.py
index d5ee2667d8..30de08d496 100644
--- a/lib/iris/coords.py
+++ b/lib/iris/coords.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Definitions of coordinates and other dimensional metadata.
 
diff --git a/lib/iris/cube.py b/lib/iris/cube.py
index 60fdbc9c94..3a36a035c0 100644
--- a/lib/iris/cube.py
+++ b/lib/iris/cube.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 """
 Classes for representing multi-dimensional data with metadata.
diff --git a/lib/iris/exceptions.py b/lib/iris/exceptions.py
index 919917a01d..c3e6b6193f 100644
--- a/lib/iris/exceptions.py
+++ b/lib/iris/exceptions.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Exceptions specific to the Iris package.
 
diff --git a/lib/iris/experimental/__init__.py b/lib/iris/experimental/__init__.py
index 40ba7fdb66..4c7c62b4f5 100644
--- a/lib/iris/experimental/__init__.py
+++ b/lib/iris/experimental/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Experimental code can be introduced to Iris through this package.
 
diff --git a/lib/iris/experimental/animate.py b/lib/iris/experimental/animate.py
index 1b6c2d46be..ba4e9e6050 100644
--- a/lib/iris/experimental/animate.py
+++ b/lib/iris/experimental/animate.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Wrapper for animating iris cubes using iris or matplotlib plotting functions
 
diff --git a/lib/iris/experimental/raster.py b/lib/iris/experimental/raster.py
index 7c95293469..6fe12ea82a 100644
--- a/lib/iris/experimental/raster.py
+++ b/lib/iris/experimental/raster.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Experimental module for importing/exporting raster data from Iris cubes using
 the GDAL library.
diff --git a/lib/iris/experimental/regrid.py b/lib/iris/experimental/regrid.py
index d5fa7c6f72..f35a483b01 100644
--- a/lib/iris/experimental/regrid.py
+++ b/lib/iris/experimental/regrid.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Regridding functions.
 
diff --git a/lib/iris/experimental/regrid_conservative.py b/lib/iris/experimental/regrid_conservative.py
index fdc23c7bc4..83e65f89af 100644
--- a/lib/iris/experimental/regrid_conservative.py
+++ b/lib/iris/experimental/regrid_conservative.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Support for conservative regridding via ESMPy.
 
diff --git a/lib/iris/experimental/representation.py b/lib/iris/experimental/representation.py
index 116b340592..785bf43e63 100644
--- a/lib/iris/experimental/representation.py
+++ b/lib/iris/experimental/representation.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 """
 Definitions of how Iris objects should be represented.
diff --git a/lib/iris/experimental/stratify.py b/lib/iris/experimental/stratify.py
index a7cfbf6876..604fda38a3 100644
--- a/lib/iris/experimental/stratify.py
+++ b/lib/iris/experimental/stratify.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Routines for putting data on new strata (aka. isosurfaces), often in the
 Z direction.
diff --git a/lib/iris/experimental/ugrid/__init__.py b/lib/iris/experimental/ugrid/__init__.py
index a3603a5355..30a934dfba 100644
--- a/lib/iris/experimental/ugrid/__init__.py
+++ b/lib/iris/experimental/ugrid/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 """
 Infra-structure for unstructured mesh support, based on
diff --git a/lib/iris/experimental/ugrid/cf.py b/lib/iris/experimental/ugrid/cf.py
index 42c1cfd0a3..ba365aeb1f 100644
--- a/lib/iris/experimental/ugrid/cf.py
+++ b/lib/iris/experimental/ugrid/cf.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 """
 Extensions to Iris' CF variable representation to represent CF UGrid variables.
diff --git a/lib/iris/experimental/ugrid/load.py b/lib/iris/experimental/ugrid/load.py
index 67d1491930..c2a4b0c563 100644
--- a/lib/iris/experimental/ugrid/load.py
+++ b/lib/iris/experimental/ugrid/load.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 """
 Extensions to Iris' NetCDF loading to allow the construction of
diff --git a/lib/iris/experimental/ugrid/mesh.py b/lib/iris/experimental/ugrid/mesh.py
index af557c345c..68d208d867 100644
--- a/lib/iris/experimental/ugrid/mesh.py
+++ b/lib/iris/experimental/ugrid/mesh.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 """
 Iris' data model representation of CF UGrid's Mesh and its constituent parts.
diff --git a/lib/iris/experimental/ugrid/metadata.py b/lib/iris/experimental/ugrid/metadata.py
index 44bbe04fe9..bfdcc7e114 100644
--- a/lib/iris/experimental/ugrid/metadata.py
+++ b/lib/iris/experimental/ugrid/metadata.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 """
 The common metadata API classes for :mod:`iris.experimental.ugrid.mesh`.
diff --git a/lib/iris/experimental/ugrid/save.py b/lib/iris/experimental/ugrid/save.py
index 3c42137905..f09740d98c 100644
--- a/lib/iris/experimental/ugrid/save.py
+++ b/lib/iris/experimental/ugrid/save.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 """
 Extensions to Iris' NetCDF saving to allow
diff --git a/lib/iris/experimental/ugrid/utils.py b/lib/iris/experimental/ugrid/utils.py
index a13a43d3fd..05e60c3ce7 100644
--- a/lib/iris/experimental/ugrid/utils.py
+++ b/lib/iris/experimental/ugrid/utils.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 """
 Utility operations specific to unstructured data.
diff --git a/lib/iris/fileformats/__init__.py b/lib/iris/fileformats/__init__.py
index 86b304b82c..b74b420802 100644
--- a/lib/iris/fileformats/__init__.py
+++ b/lib/iris/fileformats/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 A package for converting cubes to and from specific file formats.
 
diff --git a/lib/iris/fileformats/_ff.py b/lib/iris/fileformats/_ff.py
index 5121b47976..76df5d5718 100644
--- a/lib/iris/fileformats/_ff.py
+++ b/lib/iris/fileformats/_ff.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Provides UK Met Office Fields File (FF) format specific capabilities.
 
diff --git a/lib/iris/fileformats/_ff_cross_references.py b/lib/iris/fileformats/_ff_cross_references.py
index ca41f5257f..b060ed42e9 100644
--- a/lib/iris/fileformats/_ff_cross_references.py
+++ b/lib/iris/fileformats/_ff_cross_references.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Table providing UM grid-code, field-code and pseudolevel-type for (some)
 stash codes.  Used in UM file i/o.
diff --git a/lib/iris/fileformats/_nc_load_rules/__init__.py b/lib/iris/fileformats/_nc_load_rules/__init__.py
index b102a082df..ca2f341249 100644
--- a/lib/iris/fileformats/_nc_load_rules/__init__.py
+++ b/lib/iris/fileformats/_nc_load_rules/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Support for cube-specific CF-to-Iris translation operations.
 
diff --git a/lib/iris/fileformats/_nc_load_rules/actions.py b/lib/iris/fileformats/_nc_load_rules/actions.py
index 44ef7ac549..7db15d21ac 100644
--- a/lib/iris/fileformats/_nc_load_rules/actions.py
+++ b/lib/iris/fileformats/_nc_load_rules/actions.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Replacement code for the Pyke rules.
 
diff --git a/lib/iris/fileformats/_nc_load_rules/engine.py b/lib/iris/fileformats/_nc_load_rules/engine.py
index 497c2a12c9..ec7a28777b 100644
--- a/lib/iris/fileformats/_nc_load_rules/engine.py
+++ b/lib/iris/fileformats/_nc_load_rules/engine.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 A simple mimic of the Pyke 'knowledge_engine', for interfacing to the routines
 in 'iris.fileformats.netcdf' with minimal changes to that code.
diff --git a/lib/iris/fileformats/_nc_load_rules/helpers.py b/lib/iris/fileformats/_nc_load_rules/helpers.py
index 9c75c0e866..71e59feda0 100644
--- a/lib/iris/fileformats/_nc_load_rules/helpers.py
+++ b/lib/iris/fileformats/_nc_load_rules/helpers.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 All the pure-Python 'helper' functions which were previously included in the
 Pyke rules database 'fc_rules_cf.krb'.
diff --git a/lib/iris/fileformats/_pp_lbproc_pairs.py b/lib/iris/fileformats/_pp_lbproc_pairs.py
index 7ad6f21848..86a5f9381d 100644
--- a/lib/iris/fileformats/_pp_lbproc_pairs.py
+++ b/lib/iris/fileformats/_pp_lbproc_pairs.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 import itertools
 
diff --git a/lib/iris/fileformats/_structured_array_identification.py b/lib/iris/fileformats/_structured_array_identification.py
index 11c62983e3..031a5e7483 100644
--- a/lib/iris/fileformats/_structured_array_identification.py
+++ b/lib/iris/fileformats/_structured_array_identification.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 r"""
 The purpose of this module is to provide utilities for the identification
 of multi-dimensional structure in a flat sequence of homogeneous objects.
diff --git a/lib/iris/fileformats/abf.py b/lib/iris/fileformats/abf.py
index 4dcd5ce6aa..26a1f307b2 100644
--- a/lib/iris/fileformats/abf.py
+++ b/lib/iris/fileformats/abf.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Provides ABF (and ABL) file format capabilities.
 
diff --git a/lib/iris/fileformats/cf.py b/lib/iris/fileformats/cf.py
index f412955adb..86960003db 100644
--- a/lib/iris/fileformats/cf.py
+++ b/lib/iris/fileformats/cf.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Provides the capability to load netCDF files and interpret them
 according to the 'NetCDF Climate and Forecast (CF) Metadata Conventions'.
diff --git a/lib/iris/fileformats/dot.py b/lib/iris/fileformats/dot.py
index 50c02e4d04..e3a4493fe8 100644
--- a/lib/iris/fileformats/dot.py
+++ b/lib/iris/fileformats/dot.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Provides Creation and saving of DOT graphs for a :class:`iris.cube.Cube`.
 
diff --git a/lib/iris/fileformats/name.py b/lib/iris/fileformats/name.py
index 9a779cc92d..16f71a940f 100644
--- a/lib/iris/fileformats/name.py
+++ b/lib/iris/fileformats/name.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Provides NAME file format loading capabilities."""
 
 
diff --git a/lib/iris/fileformats/name_loaders.py b/lib/iris/fileformats/name_loaders.py
index cb8867b6ea..7cc7c61d81 100644
--- a/lib/iris/fileformats/name_loaders.py
+++ b/lib/iris/fileformats/name_loaders.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """NAME file format loading functions."""
 
 import collections
diff --git a/lib/iris/fileformats/netcdf/__init__.py b/lib/iris/fileformats/netcdf/__init__.py
index b696b200ff..99817c5921 100644
--- a/lib/iris/fileformats/netcdf/__init__.py
+++ b/lib/iris/fileformats/netcdf/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Module to support the loading and saving of NetCDF files, also using the CF conventions
 for metadata interpretation.
diff --git a/lib/iris/fileformats/netcdf/_dask_locks.py b/lib/iris/fileformats/netcdf/_dask_locks.py
index 15ac117a8b..b7727a1ab7 100644
--- a/lib/iris/fileformats/netcdf/_dask_locks.py
+++ b/lib/iris/fileformats/netcdf/_dask_locks.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Module containing code to create locks enabling dask workers to co-operate.
 
diff --git a/lib/iris/fileformats/netcdf/_thread_safe_nc.py b/lib/iris/fileformats/netcdf/_thread_safe_nc.py
index 21c697acab..b5226b8e42 100644
--- a/lib/iris/fileformats/netcdf/_thread_safe_nc.py
+++ b/lib/iris/fileformats/netcdf/_thread_safe_nc.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Module to ensure all calls to the netCDF4 library are thread-safe.
 
diff --git a/lib/iris/fileformats/netcdf/loader.py b/lib/iris/fileformats/netcdf/loader.py
index 29202af89e..030427a2b9 100644
--- a/lib/iris/fileformats/netcdf/loader.py
+++ b/lib/iris/fileformats/netcdf/loader.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Module to support the loading of Iris cubes from NetCDF files, also using the CF
 conventions for metadata interpretation.
diff --git a/lib/iris/fileformats/netcdf/saver.py b/lib/iris/fileformats/netcdf/saver.py
index 011f74892d..6409d8c311 100644
--- a/lib/iris/fileformats/netcdf/saver.py
+++ b/lib/iris/fileformats/netcdf/saver.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Module to support the saving of Iris cubes to a NetCDF file, also using the CF
 conventions for metadata interpretation.
diff --git a/lib/iris/fileformats/nimrod.py b/lib/iris/fileformats/nimrod.py
index 6f39ca87fa..d4e86502bd 100644
--- a/lib/iris/fileformats/nimrod.py
+++ b/lib/iris/fileformats/nimrod.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Provides NIMROD file format capabilities."""
 
 import glob
diff --git a/lib/iris/fileformats/nimrod_load_rules.py b/lib/iris/fileformats/nimrod_load_rules.py
index 17db0644ee..7347135422 100644
--- a/lib/iris/fileformats/nimrod_load_rules.py
+++ b/lib/iris/fileformats/nimrod_load_rules.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Rules for converting NIMROD fields into cubes."""
 
 import re
diff --git a/lib/iris/fileformats/pp.py b/lib/iris/fileformats/pp.py
index e19ba3adff..4b2b7eeae0 100644
--- a/lib/iris/fileformats/pp.py
+++ b/lib/iris/fileformats/pp.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Provides UK Met Office Post Process (PP) format specific capabilities.
 
diff --git a/lib/iris/fileformats/pp_load_rules.py b/lib/iris/fileformats/pp_load_rules.py
index 11d03e978a..1aed25311d 100644
--- a/lib/iris/fileformats/pp_load_rules.py
+++ b/lib/iris/fileformats/pp_load_rules.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 
 # Historically this was auto-generated from
diff --git a/lib/iris/fileformats/pp_save_rules.py b/lib/iris/fileformats/pp_save_rules.py
index 998255ff2b..7db21d5f99 100644
--- a/lib/iris/fileformats/pp_save_rules.py
+++ b/lib/iris/fileformats/pp_save_rules.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 import warnings
 
diff --git a/lib/iris/fileformats/rules.py b/lib/iris/fileformats/rules.py
index d5a4b9c823..bcfd4f8323 100644
--- a/lib/iris/fileformats/rules.py
+++ b/lib/iris/fileformats/rules.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Generalised mechanisms for metadata translation and cube construction.
 
diff --git a/lib/iris/fileformats/um/__init__.py b/lib/iris/fileformats/um/__init__.py
index c01e8301e2..ac38e45de5 100644
--- a/lib/iris/fileformats/um/__init__.py
+++ b/lib/iris/fileformats/um/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Provides iris loading support for UM Fieldsfile-like file types, and PP.
 
diff --git a/lib/iris/fileformats/um/_fast_load.py b/lib/iris/fileformats/um/_fast_load.py
index e29025c169..ce9d183586 100644
--- a/lib/iris/fileformats/um/_fast_load.py
+++ b/lib/iris/fileformats/um/_fast_load.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Support for "fast" loading of structured UM files in iris load functions,
 i.e. :meth:`iris.load` and its associates.
diff --git a/lib/iris/fileformats/um/_fast_load_structured_fields.py b/lib/iris/fileformats/um/_fast_load_structured_fields.py
index 64b7f8e891..2a41cf99ba 100644
--- a/lib/iris/fileformats/um/_fast_load_structured_fields.py
+++ b/lib/iris/fileformats/um/_fast_load_structured_fields.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Code for fast loading of structured UM data.
 
diff --git a/lib/iris/fileformats/um/_ff_replacement.py b/lib/iris/fileformats/um/_ff_replacement.py
index 0a661081c7..33ab2fbb68 100644
--- a/lib/iris/fileformats/um/_ff_replacement.py
+++ b/lib/iris/fileformats/um/_ff_replacement.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Support for UM "fieldsfile-like" files.
 
diff --git a/lib/iris/fileformats/um/_optimal_array_structuring.py b/lib/iris/fileformats/um/_optimal_array_structuring.py
index 2793d47187..3fd892808b 100644
--- a/lib/iris/fileformats/um/_optimal_array_structuring.py
+++ b/lib/iris/fileformats/um/_optimal_array_structuring.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """A module to provide an optimal array structure calculation."""
 
 
diff --git a/lib/iris/fileformats/um_cf_map.py b/lib/iris/fileformats/um_cf_map.py
index b93b192bbd..d2e51a3257 100644
--- a/lib/iris/fileformats/um_cf_map.py
+++ b/lib/iris/fileformats/um_cf_map.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Provides UM/CF phenomenon translations.
 
diff --git a/lib/iris/io/__init__.py b/lib/iris/io/__init__.py
index 4e5004ff10..c8e02a40cf 100644
--- a/lib/iris/io/__init__.py
+++ b/lib/iris/io/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Provides an interface to manage URI scheme support in iris.
 
diff --git a/lib/iris/io/format_picker.py b/lib/iris/io/format_picker.py
index 9def0ada98..d2d3b5fd41 100644
--- a/lib/iris/io/format_picker.py
+++ b/lib/iris/io/format_picker.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 A module to provide convenient file format identification through a combination of filename extension
 and file based *magic* numbers.
diff --git a/lib/iris/iterate.py b/lib/iris/iterate.py
index cc82433e85..cd950828be 100644
--- a/lib/iris/iterate.py
+++ b/lib/iris/iterate.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Cube functions for iteration in step.
 
diff --git a/lib/iris/palette.py b/lib/iris/palette.py
index 3ba17ffc97..f640cf5687 100644
--- a/lib/iris/palette.py
+++ b/lib/iris/palette.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Load, configure and register color map palettes and initialise
 color map meta-data mappings.
diff --git a/lib/iris/pandas.py b/lib/iris/pandas.py
index 0d0e65d648..535bed3a64 100644
--- a/lib/iris/pandas.py
+++ b/lib/iris/pandas.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Provide conversion to and from Pandas data structures.
 
diff --git a/lib/iris/plot.py b/lib/iris/plot.py
index b32b45195a..977cbbcfc2 100644
--- a/lib/iris/plot.py
+++ b/lib/iris/plot.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Iris-specific extensions to matplotlib, mimicking the :mod:`matplotlib.pyplot`
 interface.
diff --git a/lib/iris/quickplot.py b/lib/iris/quickplot.py
index 12b5e80697..15f4cf11e2 100644
--- a/lib/iris/quickplot.py
+++ b/lib/iris/quickplot.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 High-level plotting extensions to :mod:`iris.plot`.
 
diff --git a/lib/iris/symbols.py b/lib/iris/symbols.py
index 3d00d3bb3b..7bbbca83a9 100644
--- a/lib/iris/symbols.py
+++ b/lib/iris/symbols.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Contains symbol definitions for use with :func:`iris.plot.symbols`.
 
diff --git a/lib/iris/time.py b/lib/iris/time.py
index 51aac3d46d..ddedeedd91 100644
--- a/lib/iris/time.py
+++ b/lib/iris/time.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Time handling.
 
diff --git a/lib/iris/util.py b/lib/iris/util.py
index c040b72b54..ee415d230e 100644
--- a/lib/iris/util.py
+++ b/lib/iris/util.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Miscellaneous utility functions.
 
diff --git a/pyproject.toml b/pyproject.toml
index 4f9ade1351..88b39f1601 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,7 +15,7 @@ authors = [
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Intended Audience :: Science/Research",
-    "License :: OSI Approved :: GNU Lesser General Public License v3 or later (LGPLv3+)",
+    "License :: OSI Approved :: BSD License",
     "Operating System :: MacOS",
     "Operating System :: POSIX",
     "Operating System :: POSIX :: Linux",
@@ -48,7 +48,7 @@ keywords = [
     "ugrid",
     "visualisation",
 ]
-license = {text = "LGPL-3.0-or-later"}
+license = {text = "BSD-3-Clause"}
 name = "scitools-iris"
 requires-python = ">=3.9"
 
@@ -59,7 +59,7 @@ Documentation = "https://scitools-iris.readthedocs.io/en/stable/"
 Issues = "https://github.com/SciTools/iris/issues"
 
 [tool.setuptools]
-license-files = ["COPYING", "COPYING.LESSER"]
+license-files = ["LICENSE"]
 zip-safe = false
 
 [tool.setuptools.dynamic]
diff --git a/tools/generate_std_names.py b/tools/generate_std_names.py
index 51a31ef971..8e3b24aac6 100644
--- a/tools/generate_std_names.py
+++ b/tools/generate_std_names.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 A script to convert the standard names information from the provided XML
 file into a Python dictionary format.
@@ -27,9 +26,8 @@
 STD_VALUES_FILE_TEMPLATE = '''
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 This file contains a dictionary of standard value names that are mapped
 to another dictionary of other standard name attributes. Currently only
diff --git a/tools/release_do_nothing.py b/tools/release_do_nothing.py
index afe12a662d..bd38f0f733 100755
--- a/tools/release_do_nothing.py
+++ b/tools/release_do_nothing.py
@@ -1,9 +1,8 @@
 #!/usr/bin/env python3
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 A do-nothing script to hand-hold through the Iris release process.
 
diff --git a/tools/update_lockfiles.py b/tools/update_lockfiles.py
index 073f86cda6..a81ab8cafc 100755
--- a/tools/update_lockfiles.py
+++ b/tools/update_lockfiles.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 A command line utility for generating conda-lock files for the environments
 that nox uses for testing each different supported version of python.


Test patch:
diff --git a/docs/gallery_tests/__init__.py b/docs/gallery_tests/__init__.py
index ac5753e58b..091e997248 100644
--- a/docs/gallery_tests/__init__.py
+++ b/docs/gallery_tests/__init__.py
@@ -1,5 +1,4 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
diff --git a/docs/gallery_tests/conftest.py b/docs/gallery_tests/conftest.py
index a218b305a2..d3ca8309f8 100644
--- a/docs/gallery_tests/conftest.py
+++ b/docs/gallery_tests/conftest.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 """Pytest fixtures for the gallery tests."""
 
diff --git a/docs/gallery_tests/test_gallery_examples.py b/docs/gallery_tests/test_gallery_examples.py
index 0d0793a7da..93f361a62a 100644
--- a/docs/gallery_tests/test_gallery_examples.py
+++ b/docs/gallery_tests/test_gallery_examples.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 import importlib
 
diff --git a/docs/src/whatsnew/latest.rst b/docs/src/whatsnew/latest.rst
index 33a4a211d9..6e7087c687 100644
--- a/docs/src/whatsnew/latest.rst
+++ b/docs/src/whatsnew/latest.rst
@@ -24,7 +24,7 @@ This document explains the changes made to Iris for this release
 📢 Announcements
 ================
 
-#. N/A
+#. `@lbdreyer`_ relicensed Iris from LGPL-3 to BSD-3. (:pull: `5577`)
 
 
 ✨ Features
diff --git a/lib/iris/tests/__init__.py b/lib/iris/tests/__init__.py
index 5529b899c5..83fdb6af89 100644
--- a/lib/iris/tests/__init__.py
+++ b/lib/iris/tests/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Provides testing capabilities and customisations specific to Iris.
 
diff --git a/lib/iris/tests/experimental/__init__.py b/lib/iris/tests/experimental/__init__.py
index fa2390c45b..d31931720c 100644
--- a/lib/iris/tests/experimental/__init__.py
+++ b/lib/iris/tests/experimental/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Experimental code is tested in this package.
 
diff --git a/lib/iris/tests/experimental/regrid/__init__.py b/lib/iris/tests/experimental/regrid/__init__.py
index 653505e3d5..6837b12e91 100644
--- a/lib/iris/tests/experimental/regrid/__init__.py
+++ b/lib/iris/tests/experimental/regrid/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Regridding code is tested in this package.
 
diff --git a/lib/iris/tests/experimental/regrid/test_regrid_area_weighted_rectilinear_src_and_grid.py b/lib/iris/tests/experimental/regrid/test_regrid_area_weighted_rectilinear_src_and_grid.py
index 07961a319a..93b1a6d3e6 100644
--- a/lib/iris/tests/experimental/regrid/test_regrid_area_weighted_rectilinear_src_and_grid.py
+++ b/lib/iris/tests/experimental/regrid/test_regrid_area_weighted_rectilinear_src_and_grid.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test area weighted regridding.
 
diff --git a/lib/iris/tests/experimental/regrid/test_regrid_conservative_via_esmpy.py b/lib/iris/tests/experimental/regrid/test_regrid_conservative_via_esmpy.py
index 467c040eb3..2c7bad59ff 100644
--- a/lib/iris/tests/experimental/regrid/test_regrid_conservative_via_esmpy.py
+++ b/lib/iris/tests/experimental/regrid/test_regrid_conservative_via_esmpy.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Tests for :func:`iris.experimental.regrid.regrid_conservative_via_esmpy`.
 
diff --git a/lib/iris/tests/experimental/test_raster.py b/lib/iris/tests/experimental/test_raster.py
index ffd03e6f4d..736263f196 100644
--- a/lib/iris/tests/experimental/test_raster.py
+++ b/lib/iris/tests/experimental/test_raster.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 import iris.tests as tests  # isort:skip
 import PIL.Image
diff --git a/lib/iris/tests/graphics/__init__.py b/lib/iris/tests/graphics/__init__.py
index 5ee555cb6e..3c440264f9 100755
--- a/lib/iris/tests/graphics/__init__.py
+++ b/lib/iris/tests/graphics/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 # !/usr/bin/env python
 """
 Contains Iris graphic testing utilities
diff --git a/lib/iris/tests/graphics/idiff.py b/lib/iris/tests/graphics/idiff.py
index 4af7f4726d..1c29d4e551 100755
--- a/lib/iris/tests/graphics/idiff.py
+++ b/lib/iris/tests/graphics/idiff.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 # !/usr/bin/env python
 """
 Provides "diff-like" comparison of images.
diff --git a/lib/iris/tests/graphics/recreate_imagerepo.py b/lib/iris/tests/graphics/recreate_imagerepo.py
index 02ddaad2cb..cd4c83e9b1 100755
--- a/lib/iris/tests/graphics/recreate_imagerepo.py
+++ b/lib/iris/tests/graphics/recreate_imagerepo.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 # !/usr/bin/env python
 """
 Updates imagerepo.json based on the baseline images
diff --git a/lib/iris/tests/integration/__init__.py b/lib/iris/tests/integration/__init__.py
index 71b911cbb0..29a99030dd 100644
--- a/lib/iris/tests/integration/__init__.py
+++ b/lib/iris/tests/integration/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for the :mod:`iris` package."""
diff --git a/lib/iris/tests/integration/analysis/__init__.py b/lib/iris/tests/integration/analysis/__init__.py
index 20b6250b70..4ec86f2d5a 100644
--- a/lib/iris/tests/integration/analysis/__init__.py
+++ b/lib/iris/tests/integration/analysis/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for the :mod:`iris.analysis` package."""
diff --git a/lib/iris/tests/integration/analysis/test_area_weighted.py b/lib/iris/tests/integration/analysis/test_area_weighted.py
index d01da79a56..49c80d7bba 100644
--- a/lib/iris/tests/integration/analysis/test_area_weighted.py
+++ b/lib/iris/tests/integration/analysis/test_area_weighted.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for area weighted regridding."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/integration/aux_factory/__init__.py b/lib/iris/tests/integration/aux_factory/__init__.py
index 58ba6fb82b..3ee14d5add 100644
--- a/lib/iris/tests/integration/aux_factory/__init__.py
+++ b/lib/iris/tests/integration/aux_factory/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for the :mod:`iris.aux_factory` package."""
diff --git a/lib/iris/tests/integration/aux_factory/test_OceanSigmaZFactory.py b/lib/iris/tests/integration/aux_factory/test_OceanSigmaZFactory.py
index 4b2464b272..15f65d52ad 100644
--- a/lib/iris/tests/integration/aux_factory/test_OceanSigmaZFactory.py
+++ b/lib/iris/tests/integration/aux_factory/test_OceanSigmaZFactory.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Integratation tests for the
 `iris.aux_factory.OceanSigmaZFactory` class.
diff --git a/lib/iris/tests/integration/concatenate/__init__.py b/lib/iris/tests/integration/concatenate/__init__.py
index fb136098ee..d15b201abe 100644
--- a/lib/iris/tests/integration/concatenate/__init__.py
+++ b/lib/iris/tests/integration/concatenate/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for the :mod:`iris._concatenate` package."""
diff --git a/lib/iris/tests/integration/concatenate/test_concatenate.py b/lib/iris/tests/integration/concatenate/test_concatenate.py
index 2543e2931b..9bd6bcb0c5 100644
--- a/lib/iris/tests/integration/concatenate/test_concatenate.py
+++ b/lib/iris/tests/integration/concatenate/test_concatenate.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Integration tests for concatenating cubes with differing time coord epochs
 using :func:`iris.util.unify_time_units`.
diff --git a/lib/iris/tests/integration/experimental/__init__.py b/lib/iris/tests/integration/experimental/__init__.py
index 269cf3dd9a..79722df7a3 100644
--- a/lib/iris/tests/integration/experimental/__init__.py
+++ b/lib/iris/tests/integration/experimental/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for the :mod:`iris.experimental` package."""
diff --git a/lib/iris/tests/integration/experimental/test_CubeRepresentation.py b/lib/iris/tests/integration/experimental/test_CubeRepresentation.py
index 48a3e51b52..0c1386d59f 100644
--- a/lib/iris/tests/integration/experimental/test_CubeRepresentation.py
+++ b/lib/iris/tests/integration/experimental/test_CubeRepresentation.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for cube html representation."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/integration/experimental/test_regrid_ProjectedUnstructured.py b/lib/iris/tests/integration/experimental/test_regrid_ProjectedUnstructured.py
index 742adc8c15..4ae48fe6f9 100644
--- a/lib/iris/tests/integration/experimental/test_regrid_ProjectedUnstructured.py
+++ b/lib/iris/tests/integration/experimental/test_regrid_ProjectedUnstructured.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for experimental regridding."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/integration/experimental/test_ugrid_load.py b/lib/iris/tests/integration/experimental/test_ugrid_load.py
index d94e85d2f5..1bd39695ec 100644
--- a/lib/iris/tests/integration/experimental/test_ugrid_load.py
+++ b/lib/iris/tests/integration/experimental/test_ugrid_load.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Integration tests for NetCDF-UGRID file loading.
 
diff --git a/lib/iris/tests/integration/experimental/test_ugrid_save.py b/lib/iris/tests/integration/experimental/test_ugrid_save.py
index 803ac71caa..710ed6941d 100644
--- a/lib/iris/tests/integration/experimental/test_ugrid_save.py
+++ b/lib/iris/tests/integration/experimental/test_ugrid_save.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Integration tests for NetCDF-UGRID file saving.
 
diff --git a/lib/iris/tests/integration/fast_load/__init__.py b/lib/iris/tests/integration/fast_load/__init__.py
index a94785ca58..40fc56f129 100644
--- a/lib/iris/tests/integration/fast_load/__init__.py
+++ b/lib/iris/tests/integration/fast_load/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for :mod:`iris.fileformats.um` fast load functions."""
diff --git a/lib/iris/tests/integration/fast_load/test_fast_load.py b/lib/iris/tests/integration/fast_load/test_fast_load.py
index 318292615b..a37f1eef07 100644
--- a/lib/iris/tests/integration/fast_load/test_fast_load.py
+++ b/lib/iris/tests/integration/fast_load/test_fast_load.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for fast-loading FF and PP files."""
 
 # import iris tests first so that some things can be initialised
diff --git a/lib/iris/tests/integration/merge/__init__.py b/lib/iris/tests/integration/merge/__init__.py
index 9374976532..ae16d4fe45 100644
--- a/lib/iris/tests/integration/merge/__init__.py
+++ b/lib/iris/tests/integration/merge/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for the :mod:`iris._merge` package."""
diff --git a/lib/iris/tests/integration/merge/test_merge.py b/lib/iris/tests/integration/merge/test_merge.py
index f5f92a7a7d..87b52fd85d 100644
--- a/lib/iris/tests/integration/merge/test_merge.py
+++ b/lib/iris/tests/integration/merge/test_merge.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Integration tests for merging cubes.
 
diff --git a/lib/iris/tests/integration/netcdf/__init__.py b/lib/iris/tests/integration/netcdf/__init__.py
index f500b52520..bd62b4d988 100644
--- a/lib/iris/tests/integration/netcdf/__init__.py
+++ b/lib/iris/tests/integration/netcdf/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for loading and saving netcdf files."""
diff --git a/lib/iris/tests/integration/netcdf/test__dask_locks.py b/lib/iris/tests/integration/netcdf/test__dask_locks.py
index c41af1b356..70891bc40c 100644
--- a/lib/iris/tests/integration/netcdf/test__dask_locks.py
+++ b/lib/iris/tests/integration/netcdf/test__dask_locks.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :mod:`iris.fileformats.netcdf._dask_locks` package.
 
diff --git a/lib/iris/tests/integration/netcdf/test_attributes.py b/lib/iris/tests/integration/netcdf/test_attributes.py
index a73d6c7d49..aab91bcb31 100644
--- a/lib/iris/tests/integration/netcdf/test_attributes.py
+++ b/lib/iris/tests/integration/netcdf/test_attributes.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for attribute-related loading and saving netcdf files."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/integration/netcdf/test_aux_factories.py b/lib/iris/tests/integration/netcdf/test_aux_factories.py
index d89f275336..6b3dde6fd1 100644
--- a/lib/iris/tests/integration/netcdf/test_aux_factories.py
+++ b/lib/iris/tests/integration/netcdf/test_aux_factories.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for aux-factory-related loading and saving netcdf files."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/integration/netcdf/test_coord_systems.py b/lib/iris/tests/integration/netcdf/test_coord_systems.py
index 3175664b4c..b7b21911e5 100644
--- a/lib/iris/tests/integration/netcdf/test_coord_systems.py
+++ b/lib/iris/tests/integration/netcdf/test_coord_systems.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for coord-system-related loading and saving netcdf files."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/integration/netcdf/test_delayed_save.py b/lib/iris/tests/integration/netcdf/test_delayed_save.py
index 09f6235aab..d3f2ce22c4 100644
--- a/lib/iris/tests/integration/netcdf/test_delayed_save.py
+++ b/lib/iris/tests/integration/netcdf/test_delayed_save.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Integration tests for delayed saving.
 """
diff --git a/lib/iris/tests/integration/netcdf/test_general.py b/lib/iris/tests/integration/netcdf/test_general.py
index 6214f09e7e..0fc619e4cb 100644
--- a/lib/iris/tests/integration/netcdf/test_general.py
+++ b/lib/iris/tests/integration/netcdf/test_general.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for loading and saving netcdf files."""
 # Import iris.tests first so that some things can be initialised before
 # importing anything else.
diff --git a/lib/iris/tests/integration/netcdf/test_self_referencing.py b/lib/iris/tests/integration/netcdf/test_self_referencing.py
index 554fabb4fc..4e5da18bbd 100644
--- a/lib/iris/tests/integration/netcdf/test_self_referencing.py
+++ b/lib/iris/tests/integration/netcdf/test_self_referencing.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for iris#3367 - loading a self-referencing NetCDF file."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/integration/netcdf/test_thread_safety.py b/lib/iris/tests/integration/netcdf/test_thread_safety.py
index c5779250a2..916cbf67e1 100644
--- a/lib/iris/tests/integration/netcdf/test_thread_safety.py
+++ b/lib/iris/tests/integration/netcdf/test_thread_safety.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Integration tests covering thread safety during loading/saving netcdf files.
 
diff --git a/lib/iris/tests/integration/plot/__init__.py b/lib/iris/tests/integration/plot/__init__.py
index aafa488e2d..c67303c0f3 100644
--- a/lib/iris/tests/integration/plot/__init__.py
+++ b/lib/iris/tests/integration/plot/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for the :mod:`iris.plot` package."""
diff --git a/lib/iris/tests/integration/plot/test_animate.py b/lib/iris/tests/integration/plot/test_animate.py
index ef19dbb108..1354ef4289 100644
--- a/lib/iris/tests/integration/plot/test_animate.py
+++ b/lib/iris/tests/integration/plot/test_animate.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Integration tests for :func:`iris.plot.animate`.
 
diff --git a/lib/iris/tests/integration/plot/test_colorbar.py b/lib/iris/tests/integration/plot/test_colorbar.py
index a306e6c82f..c742564c7d 100644
--- a/lib/iris/tests/integration/plot/test_colorbar.py
+++ b/lib/iris/tests/integration/plot/test_colorbar.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test interaction between :mod:`iris.plot` and
 :func:`matplotlib.pyplot.colorbar`
diff --git a/lib/iris/tests/integration/plot/test_netcdftime.py b/lib/iris/tests/integration/plot/test_netcdftime.py
index d438c09bd5..2b3a59d093 100644
--- a/lib/iris/tests/integration/plot/test_netcdftime.py
+++ b/lib/iris/tests/integration/plot/test_netcdftime.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test plot of time coord with non-standard calendar.
 
diff --git a/lib/iris/tests/integration/plot/test_nzdateline.py b/lib/iris/tests/integration/plot/test_nzdateline.py
index 0051549794..2c9360e9ea 100644
--- a/lib/iris/tests/integration/plot/test_nzdateline.py
+++ b/lib/iris/tests/integration/plot/test_nzdateline.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test set up of limited area map extents which bridge the date line.
 
diff --git a/lib/iris/tests/integration/plot/test_plot_2d_coords.py b/lib/iris/tests/integration/plot/test_plot_2d_coords.py
index 1b95899803..673f8817d6 100644
--- a/lib/iris/tests/integration/plot/test_plot_2d_coords.py
+++ b/lib/iris/tests/integration/plot/test_plot_2d_coords.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test plots with two dimensional coordinates.
 
diff --git a/lib/iris/tests/integration/plot/test_vector_plots.py b/lib/iris/tests/integration/plot/test_vector_plots.py
index 37f506bd17..652a205fd8 100644
--- a/lib/iris/tests/integration/plot/test_vector_plots.py
+++ b/lib/iris/tests/integration/plot/test_vector_plots.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test some key usages of :func:`iris.plot.quiver`.
 
diff --git a/lib/iris/tests/integration/test_Datums.py b/lib/iris/tests/integration/test_Datums.py
index 43287c7040..8325ad901a 100755
--- a/lib/iris/tests/integration/test_Datums.py
+++ b/lib/iris/tests/integration/test_Datums.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for :class:`iris.coord_systems` datum support."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/integration/test_PartialDateTime.py b/lib/iris/tests/integration/test_PartialDateTime.py
index 563af1035c..ed995beda7 100644
--- a/lib/iris/tests/integration/test_PartialDateTime.py
+++ b/lib/iris/tests/integration/test_PartialDateTime.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for :class:`iris.time.PartialDateTime`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/integration/test_climatology.py b/lib/iris/tests/integration/test_climatology.py
index 54d43858fb..f15428eb9d 100644
--- a/lib/iris/tests/integration/test_climatology.py
+++ b/lib/iris/tests/integration/test_climatology.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for loading and saving netcdf files."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/integration/test_cube.py b/lib/iris/tests/integration/test_cube.py
index ad6666d28e..8f3ac5fb48 100644
--- a/lib/iris/tests/integration/test_cube.py
+++ b/lib/iris/tests/integration/test_cube.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for :class:`iris.cube.Cube`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/integration/test_ff.py b/lib/iris/tests/integration/test_ff.py
index 0b0ccf4c5c..b613da385f 100644
--- a/lib/iris/tests/integration/test_ff.py
+++ b/lib/iris/tests/integration/test_ff.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for loading LBC fieldsfiles."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/integration/test_new_axis.py b/lib/iris/tests/integration/test_new_axis.py
index 876eccbb63..7c8da13ae5 100644
--- a/lib/iris/tests/integration/test_new_axis.py
+++ b/lib/iris/tests/integration/test_new_axis.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for :func:`iris.util.new_axis`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/integration/test_pickle.py b/lib/iris/tests/integration/test_pickle.py
index fa5ddbd73e..7317855512 100644
--- a/lib/iris/tests/integration/test_pickle.py
+++ b/lib/iris/tests/integration/test_pickle.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for pickling things."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/integration/test_pp.py b/lib/iris/tests/integration/test_pp.py
index 026bdae58a..bab925bd7e 100644
--- a/lib/iris/tests/integration/test_pp.py
+++ b/lib/iris/tests/integration/test_pp.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for loading and saving PP files."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/integration/test_pp_constrained_load_cubes.py b/lib/iris/tests/integration/test_pp_constrained_load_cubes.py
index 7ddf39b2ff..5ba8978ed1 100644
--- a/lib/iris/tests/integration/test_pp_constrained_load_cubes.py
+++ b/lib/iris/tests/integration/test_pp_constrained_load_cubes.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for :func:`iris.fileformats.rules.load_cubes`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/integration/test_regrid_equivalence.py b/lib/iris/tests/integration/test_regrid_equivalence.py
index 09b47072e0..6bcb1ce403 100644
--- a/lib/iris/tests/integration/test_regrid_equivalence.py
+++ b/lib/iris/tests/integration/test_regrid_equivalence.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Tests to check the validity of replacing
 "iris.analysis._interpolate.regrid`('nearest')" with
diff --git a/lib/iris/tests/integration/test_regridding.py b/lib/iris/tests/integration/test_regridding.py
index 3e87a8d0aa..44e9fef22e 100644
--- a/lib/iris/tests/integration/test_regridding.py
+++ b/lib/iris/tests/integration/test_regridding.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for regridding."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/integration/test_subset.py b/lib/iris/tests/integration/test_subset.py
index bc2029afba..457616cee3 100644
--- a/lib/iris/tests/integration/test_subset.py
+++ b/lib/iris/tests/integration/test_subset.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for subset."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/integration/test_trajectory.py b/lib/iris/tests/integration/test_trajectory.py
index a8e3acaa41..abe8fd0a2e 100644
--- a/lib/iris/tests/integration/test_trajectory.py
+++ b/lib/iris/tests/integration/test_trajectory.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for :mod:`iris.analysis.trajectory`."""
 
 # import iris tests first so that some things can be initialised before
diff --git a/lib/iris/tests/integration/um/__init__.py b/lib/iris/tests/integration/um/__init__.py
index a94785ca58..40fc56f129 100644
--- a/lib/iris/tests/integration/um/__init__.py
+++ b/lib/iris/tests/integration/um/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Integration tests for :mod:`iris.fileformats.um` fast load functions."""
diff --git a/lib/iris/tests/integration/um/test_fieldsfile.py b/lib/iris/tests/integration/um/test_fieldsfile.py
index 56b88c2b6d..2aff7a2989 100644
--- a/lib/iris/tests/integration/um/test_fieldsfile.py
+++ b/lib/iris/tests/integration/um/test_fieldsfile.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test the fast loading of structured Fieldsfiles.
 
diff --git a/lib/iris/tests/pp.py b/lib/iris/tests/pp.py
index d8eb3256c4..3e07ccbd7f 100644
--- a/lib/iris/tests/pp.py
+++ b/lib/iris/tests/pp.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 import contextlib
 import os.path
diff --git a/lib/iris/tests/stock/__init__.py b/lib/iris/tests/stock/__init__.py
index 632dc95e20..c66c13bba5 100644
--- a/lib/iris/tests/stock/__init__.py
+++ b/lib/iris/tests/stock/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 A collection of routines which create standard Cubes/files for test purposes.
 
diff --git a/lib/iris/tests/stock/_stock_2d_latlons.py b/lib/iris/tests/stock/_stock_2d_latlons.py
index 4733a15305..889f8bce12 100644
--- a/lib/iris/tests/stock/_stock_2d_latlons.py
+++ b/lib/iris/tests/stock/_stock_2d_latlons.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Extra stock routines for making and manipulating cubes with 2d coordinates,
 to mimic ocean grid data.
diff --git a/lib/iris/tests/stock/mesh.py b/lib/iris/tests/stock/mesh.py
index da226a3790..7726849252 100644
--- a/lib/iris/tests/stock/mesh.py
+++ b/lib/iris/tests/stock/mesh.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Helper functions making objects for unstructured mesh testing."""
 
 
diff --git a/lib/iris/tests/stock/netcdf.py b/lib/iris/tests/stock/netcdf.py
index bf93f01f6b..0f6a08b596 100644
--- a/lib/iris/tests/stock/netcdf.py
+++ b/lib/iris/tests/stock/netcdf.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Routines for generating synthetic NetCDF files from template headers."""
 
 from pathlib import Path
diff --git a/lib/iris/tests/system_test.py b/lib/iris/tests/system_test.py
index 745163b485..440b544f94 100644
--- a/lib/iris/tests/system_test.py
+++ b/lib/iris/tests/system_test.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 
 """
diff --git a/lib/iris/tests/test_abf.py b/lib/iris/tests/test_abf.py
index 0b398879fc..92ed337710 100644
--- a/lib/iris/tests/test_abf.py
+++ b/lib/iris/tests/test_abf.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # import iris tests first so that some things can be initialised before
 # importing anything else
diff --git a/lib/iris/tests/test_aggregate_by.py b/lib/iris/tests/test_aggregate_by.py
index e5614f6b63..e34d2ff1bd 100644
--- a/lib/iris/tests/test_aggregate_by.py
+++ b/lib/iris/tests/test_aggregate_by.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # import iris tests first so that some things can be initialised before
 # importing anything else
diff --git a/lib/iris/tests/test_analysis.py b/lib/iris/tests/test_analysis.py
index 0d88a23055..f611e25c4e 100644
--- a/lib/iris/tests/test_analysis.py
+++ b/lib/iris/tests/test_analysis.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 
 # import iris tests first so that some things can be initialised before importing anything else
diff --git a/lib/iris/tests/test_analysis_calculus.py b/lib/iris/tests/test_analysis_calculus.py
index 86cc79092b..36e008f38e 100644
--- a/lib/iris/tests/test_analysis_calculus.py
+++ b/lib/iris/tests/test_analysis_calculus.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # import iris tests first so that some things can be initialised before importing anything else
 import iris.tests as tests  # isort:skip
diff --git a/lib/iris/tests/test_basic_maths.py b/lib/iris/tests/test_basic_maths.py
index 4d92b9a92c..c0329b72d6 100644
--- a/lib/iris/tests/test_basic_maths.py
+++ b/lib/iris/tests/test_basic_maths.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # import iris tests first so that some things can be initialised before importing anything else
 import iris.tests as tests  # isort:skip
diff --git a/lib/iris/tests/test_cartography.py b/lib/iris/tests/test_cartography.py
index c9647dc48e..58dccb78aa 100644
--- a/lib/iris/tests/test_cartography.py
+++ b/lib/iris/tests/test_cartography.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Tests elements of the cartography module.
 
diff --git a/lib/iris/tests/test_cdm.py b/lib/iris/tests/test_cdm.py
index 0abb35c566..c748b9dfd4 100644
--- a/lib/iris/tests/test_cdm.py
+++ b/lib/iris/tests/test_cdm.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test cube indexing, slicing, and extracting, and also the dot graphs.
 
diff --git a/lib/iris/tests/test_cell.py b/lib/iris/tests/test_cell.py
index 21d2603072..3925d9b0a7 100644
--- a/lib/iris/tests/test_cell.py
+++ b/lib/iris/tests/test_cell.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # import iris tests first so that some things can be initialised before importing anything else
 import iris.tests as tests  # isort:skip
diff --git a/lib/iris/tests/test_cf.py b/lib/iris/tests/test_cf.py
index 3abd6b981b..70f24478d2 100644
--- a/lib/iris/tests/test_cf.py
+++ b/lib/iris/tests/test_cf.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test the cf module.
 
diff --git a/lib/iris/tests/test_coding_standards.py b/lib/iris/tests/test_coding_standards.py
index 54309e3906..e3a1d2eaf3 100644
--- a/lib/iris/tests/test_coding_standards.py
+++ b/lib/iris/tests/test_coding_standards.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # import iris.tests first so that some things can be initialised before
 # importing anything else
@@ -23,9 +22,8 @@
 
 LICENSE_TEMPLATE = """# Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details."""
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details."""
 
 # Guess iris repo directory of Iris - realpath is used to mitigate against
 # Python finding the iris package via a symlink.
diff --git a/lib/iris/tests/test_concatenate.py b/lib/iris/tests/test_concatenate.py
index ec92838466..7d28d48c31 100644
--- a/lib/iris/tests/test_concatenate.py
+++ b/lib/iris/tests/test_concatenate.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test the cube concatenate mechanism.
 
diff --git a/lib/iris/tests/test_constraints.py b/lib/iris/tests/test_constraints.py
index e568105f91..b034525ff2 100644
--- a/lib/iris/tests/test_constraints.py
+++ b/lib/iris/tests/test_constraints.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test the constrained cube loading mechanism.
 
diff --git a/lib/iris/tests/test_coord_api.py b/lib/iris/tests/test_coord_api.py
index ea99ae06df..5eb12ba1f3 100644
--- a/lib/iris/tests/test_coord_api.py
+++ b/lib/iris/tests/test_coord_api.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 
 # import iris tests first so that some things can be initialised before
diff --git a/lib/iris/tests/test_coordsystem.py b/lib/iris/tests/test_coordsystem.py
index 2e5aef249c..e62a94f080 100644
--- a/lib/iris/tests/test_coordsystem.py
+++ b/lib/iris/tests/test_coordsystem.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # import iris tests first so that some things can be initialised before importing anything else
 import iris.tests as tests  # isort:skip
diff --git a/lib/iris/tests/test_cube.py b/lib/iris/tests/test_cube.py
index c9b76539d2..d13db758a5 100644
--- a/lib/iris/tests/test_cube.py
+++ b/lib/iris/tests/test_cube.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # import iris tests first so that some things can be initialised before
 # importing anything else
diff --git a/lib/iris/tests/test_cube_to_pp.py b/lib/iris/tests/test_cube_to_pp.py
index a6fc5e3149..1a6be27f9c 100644
--- a/lib/iris/tests/test_cube_to_pp.py
+++ b/lib/iris/tests/test_cube_to_pp.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # import iris tests first so that some things can be initialised before importing anything else
 import iris.tests as tests  # isort:skip
diff --git a/lib/iris/tests/test_ff.py b/lib/iris/tests/test_ff.py
index 95f3b1493b..1abfafdac1 100644
--- a/lib/iris/tests/test_ff.py
+++ b/lib/iris/tests/test_ff.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test the Fieldsfile file loading plugin and FFHeader.
 
diff --git a/lib/iris/tests/test_file_load.py b/lib/iris/tests/test_file_load.py
index 0fe69ff583..d0b9b2461a 100644
--- a/lib/iris/tests/test_file_load.py
+++ b/lib/iris/tests/test_file_load.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test the file loading mechanism.
 
diff --git a/lib/iris/tests/test_file_save.py b/lib/iris/tests/test_file_save.py
index 216637202a..dc901db715 100644
--- a/lib/iris/tests/test_file_save.py
+++ b/lib/iris/tests/test_file_save.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test the file saving mechanism.
 
diff --git a/lib/iris/tests/test_hybrid.py b/lib/iris/tests/test_hybrid.py
index b070f36a7a..e3e5076650 100644
--- a/lib/iris/tests/test_hybrid.py
+++ b/lib/iris/tests/test_hybrid.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test the hybrid vertical coordinate representations.
 
diff --git a/lib/iris/tests/test_image_json.py b/lib/iris/tests/test_image_json.py
index b5213156f8..75e40822dc 100644
--- a/lib/iris/tests/test_image_json.py
+++ b/lib/iris/tests/test_image_json.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # import iris tests first so that some things can be initialised before
 # importing anything else
diff --git a/lib/iris/tests/test_imports.py b/lib/iris/tests/test_imports.py
index ca0d262ec4..46c7cae723 100644
--- a/lib/iris/tests/test_imports.py
+++ b/lib/iris/tests/test_imports.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # import iris tests first so that some things can be initialised before importing anything else
 import iris.tests as tests  # isort:skip
diff --git a/lib/iris/tests/test_intersect.py b/lib/iris/tests/test_intersect.py
index 01e9f79af5..29603f61a8 100644
--- a/lib/iris/tests/test_intersect.py
+++ b/lib/iris/tests/test_intersect.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test the intersection of Coords
 
diff --git a/lib/iris/tests/test_io_init.py b/lib/iris/tests/test_io_init.py
index 82da82cfa9..852944eee5 100644
--- a/lib/iris/tests/test_io_init.py
+++ b/lib/iris/tests/test_io_init.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test the io/__init__.py module.
 
diff --git a/lib/iris/tests/test_iterate.py b/lib/iris/tests/test_iterate.py
index 6317ef32b5..1bee6db74f 100644
--- a/lib/iris/tests/test_iterate.py
+++ b/lib/iris/tests/test_iterate.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test the iteration of cubes in step.
 
diff --git a/lib/iris/tests/test_lazy_aggregate_by.py b/lib/iris/tests/test_lazy_aggregate_by.py
index 57b748e52f..690198c25a 100644
--- a/lib/iris/tests/test_lazy_aggregate_by.py
+++ b/lib/iris/tests/test_lazy_aggregate_by.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 import unittest
 
 from iris._lazy_data import as_lazy_data
diff --git a/lib/iris/tests/test_load.py b/lib/iris/tests/test_load.py
index adb33924e5..1189f74b55 100644
--- a/lib/iris/tests/test_load.py
+++ b/lib/iris/tests/test_load.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test the main loading API.
 
diff --git a/lib/iris/tests/test_mapping.py b/lib/iris/tests/test_mapping.py
index 202c319b61..6ea4571630 100644
--- a/lib/iris/tests/test_mapping.py
+++ b/lib/iris/tests/test_mapping.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Tests map creation.
 
diff --git a/lib/iris/tests/test_merge.py b/lib/iris/tests/test_merge.py
index e53bbfb5f3..054fd3a20b 100644
--- a/lib/iris/tests/test_merge.py
+++ b/lib/iris/tests/test_merge.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test the cube merging mechanism.
 
diff --git a/lib/iris/tests/test_name.py b/lib/iris/tests/test_name.py
index b4e91bafd7..51bc92c28c 100644
--- a/lib/iris/tests/test_name.py
+++ b/lib/iris/tests/test_name.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Tests for NAME loading."""
 
 # import iris tests first so that some things can be initialised before
diff --git a/lib/iris/tests/test_netcdf.py b/lib/iris/tests/test_netcdf.py
index 2e389942bf..793f8df876 100644
--- a/lib/iris/tests/test_netcdf.py
+++ b/lib/iris/tests/test_netcdf.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test CF-NetCDF file loading and saving.
 
diff --git a/lib/iris/tests/test_nimrod.py b/lib/iris/tests/test_nimrod.py
index 6d62623198..ed60a516c8 100644
--- a/lib/iris/tests/test_nimrod.py
+++ b/lib/iris/tests/test_nimrod.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # import iris tests first so that some things can be initialised before
 # importing anything else
diff --git a/lib/iris/tests/test_peak.py b/lib/iris/tests/test_peak.py
index a2b6894149..1d9dd68cc1 100644
--- a/lib/iris/tests/test_peak.py
+++ b/lib/iris/tests/test_peak.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # Import iris.tests first so that some things can be initialised before
 # importing anything else.
diff --git a/lib/iris/tests/test_pickling.py b/lib/iris/tests/test_pickling.py
index 26247e795b..342b07cb03 100644
--- a/lib/iris/tests/test_pickling.py
+++ b/lib/iris/tests/test_pickling.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test pickling of Iris objects.
 
diff --git a/lib/iris/tests/test_plot.py b/lib/iris/tests/test_plot.py
index 55c912f423..150d521e34 100644
--- a/lib/iris/tests/test_plot.py
+++ b/lib/iris/tests/test_plot.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # import iris tests first so that some things can be initialised before
 # importing anything else
diff --git a/lib/iris/tests/test_pp_cf.py b/lib/iris/tests/test_pp_cf.py
index 49bedaf1e2..44650919e1 100644
--- a/lib/iris/tests/test_pp_cf.py
+++ b/lib/iris/tests/test_pp_cf.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # import iris tests first so that some things can be initialised before importing anything else
 import iris.tests as tests  # isort:skip
diff --git a/lib/iris/tests/test_pp_module.py b/lib/iris/tests/test_pp_module.py
index ca7f1c50eb..b8606e3120 100644
--- a/lib/iris/tests/test_pp_module.py
+++ b/lib/iris/tests/test_pp_module.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # import iris tests first so that some things can be initialised before importing anything else
 import iris.tests as tests  # isort:skip
diff --git a/lib/iris/tests/test_pp_stash.py b/lib/iris/tests/test_pp_stash.py
index 42390ab2b3..733d1697de 100644
--- a/lib/iris/tests/test_pp_stash.py
+++ b/lib/iris/tests/test_pp_stash.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # import iris tests first so that some things can be initialised before importing anything else
 import iris.tests as tests  # isort:skip
diff --git a/lib/iris/tests/test_pp_to_cube.py b/lib/iris/tests/test_pp_to_cube.py
index eb006fb88e..d9c47c7841 100644
--- a/lib/iris/tests/test_pp_to_cube.py
+++ b/lib/iris/tests/test_pp_to_cube.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # import iris tests first so that some things can be initialised before importing anything else
 import iris.tests as tests  # isort:skip
diff --git a/lib/iris/tests/test_quickplot.py b/lib/iris/tests/test_quickplot.py
index df2db12de6..c42a8989fb 100644
--- a/lib/iris/tests/test_quickplot.py
+++ b/lib/iris/tests/test_quickplot.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Tests the high-level plotting interface.
 
diff --git a/lib/iris/tests/test_std_names.py b/lib/iris/tests/test_std_names.py
index 48d32acbee..bc50903ab6 100644
--- a/lib/iris/tests/test_std_names.py
+++ b/lib/iris/tests/test_std_names.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # import iris tests first so that some things can be initialised before importing anything else
 import iris.tests as tests  # isort:skip
diff --git a/lib/iris/tests/test_uri_callback.py b/lib/iris/tests/test_uri_callback.py
index 67831945c5..62ae1b7fc8 100644
--- a/lib/iris/tests/test_uri_callback.py
+++ b/lib/iris/tests/test_uri_callback.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 # import iris tests first so that some things can be initialised before importing anything else
 import iris.tests as tests  # isort:skip
diff --git a/lib/iris/tests/test_util.py b/lib/iris/tests/test_util.py
index d8d5d73e95..cf1dc44755 100644
--- a/lib/iris/tests/test_util.py
+++ b/lib/iris/tests/test_util.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test iris.util
 
diff --git a/lib/iris/tests/unit/__init__.py b/lib/iris/tests/unit/__init__.py
index 50929c8020..c03d437279 100644
--- a/lib/iris/tests/unit/__init__.py
+++ b/lib/iris/tests/unit/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris` package."""
diff --git a/lib/iris/tests/unit/analysis/__init__.py b/lib/iris/tests/unit/analysis/__init__.py
index 974b4e3584..4f957bd501 100644
--- a/lib/iris/tests/unit/analysis/__init__.py
+++ b/lib/iris/tests/unit/analysis/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.analysis` package."""
diff --git a/lib/iris/tests/unit/analysis/area_weighted/__init__.py b/lib/iris/tests/unit/analysis/area_weighted/__init__.py
index 464036a6dd..2cccaec14c 100644
--- a/lib/iris/tests/unit/analysis/area_weighted/__init__.py
+++ b/lib/iris/tests/unit/analysis/area_weighted/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.analysis._area_weighted` module."""
diff --git a/lib/iris/tests/unit/analysis/area_weighted/test_AreaWeightedRegridder.py b/lib/iris/tests/unit/analysis/area_weighted/test_AreaWeightedRegridder.py
index ecaa028ab3..2d873ad011 100644
--- a/lib/iris/tests/unit/analysis/area_weighted/test_AreaWeightedRegridder.py
+++ b/lib/iris/tests/unit/analysis/area_weighted/test_AreaWeightedRegridder.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for :class:`iris.analysis._area_weighted.AreaWeightedRegridder`.
 
diff --git a/lib/iris/tests/unit/analysis/cartography/__init__.py b/lib/iris/tests/unit/analysis/cartography/__init__.py
index 625a6fa141..ff3db13198 100644
--- a/lib/iris/tests/unit/analysis/cartography/__init__.py
+++ b/lib/iris/tests/unit/analysis/cartography/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.analysis.cartography` module."""
diff --git a/lib/iris/tests/unit/analysis/cartography/test__get_lon_lat_coords.py b/lib/iris/tests/unit/analysis/cartography/test__get_lon_lat_coords.py
index 612e5d8ecf..23c7097902 100644
--- a/lib/iris/tests/unit/analysis/cartography/test__get_lon_lat_coords.py
+++ b/lib/iris/tests/unit/analysis/cartography/test__get_lon_lat_coords.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris.analysis.cartography._get_lon_lat_coords"""
 
 import pytest
diff --git a/lib/iris/tests/unit/analysis/cartography/test__quadrant_area.py b/lib/iris/tests/unit/analysis/cartography/test__quadrant_area.py
index a44661292f..e5f6964e22 100644
--- a/lib/iris/tests/unit/analysis/cartography/test__quadrant_area.py
+++ b/lib/iris/tests/unit/analysis/cartography/test__quadrant_area.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 """Unit tests for the `iris.analysis.cartography._quadrant_area` function"""
 
diff --git a/lib/iris/tests/unit/analysis/cartography/test__xy_range.py b/lib/iris/tests/unit/analysis/cartography/test__xy_range.py
index 009c97fc34..eeafc533e4 100644
--- a/lib/iris/tests/unit/analysis/cartography/test__xy_range.py
+++ b/lib/iris/tests/unit/analysis/cartography/test__xy_range.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 """Unit tests for :func:`iris.analysis.cartography._xy_range`"""
 
diff --git a/lib/iris/tests/unit/analysis/cartography/test_area_weights.py b/lib/iris/tests/unit/analysis/cartography/test_area_weights.py
index 696841ddd6..29c906f0d1 100644
--- a/lib/iris/tests/unit/analysis/cartography/test_area_weights.py
+++ b/lib/iris/tests/unit/analysis/cartography/test_area_weights.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 
 """Unit tests for the `iris.analysis.cartography.area_weights` function"""
 
diff --git a/lib/iris/tests/unit/analysis/cartography/test_gridcell_angles.py b/lib/iris/tests/unit/analysis/cartography/test_gridcell_angles.py
index 810851362e..f3f8c81583 100644
--- a/lib/iris/tests/unit/analysis/cartography/test_gridcell_angles.py
+++ b/lib/iris/tests/unit/analysis/cartography/test_gridcell_angles.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the function
 :func:`iris.analysis.cartography.gridcell_angles`.
diff --git a/lib/iris/tests/unit/analysis/cartography/test_project.py b/lib/iris/tests/unit/analysis/cartography/test_project.py
index c00830aacc..7b52f4492e 100644
--- a/lib/iris/tests/unit/analysis/cartography/test_project.py
+++ b/lib/iris/tests/unit/analysis/cartography/test_project.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :func:`iris.analysis.cartography.project`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/cartography/test_rotate_grid_vectors.py b/lib/iris/tests/unit/analysis/cartography/test_rotate_grid_vectors.py
index f5c882a983..389dfaeb3a 100644
--- a/lib/iris/tests/unit/analysis/cartography/test_rotate_grid_vectors.py
+++ b/lib/iris/tests/unit/analysis/cartography/test_rotate_grid_vectors.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the function
 :func:`iris.analysis.cartography.rotate_grid_vectors`.
diff --git a/lib/iris/tests/unit/analysis/cartography/test_rotate_winds.py b/lib/iris/tests/unit/analysis/cartography/test_rotate_winds.py
index 212a39bf2d..af1a2b8b42 100644
--- a/lib/iris/tests/unit/analysis/cartography/test_rotate_winds.py
+++ b/lib/iris/tests/unit/analysis/cartography/test_rotate_winds.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the function
 :func:`iris.analysis.cartography.rotate_winds`.
diff --git a/lib/iris/tests/unit/analysis/geometry/__init__.py b/lib/iris/tests/unit/analysis/geometry/__init__.py
index c57f5e246a..25fa6af6cb 100644
--- a/lib/iris/tests/unit/analysis/geometry/__init__.py
+++ b/lib/iris/tests/unit/analysis/geometry/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.analysis.geometry` module."""
diff --git a/lib/iris/tests/unit/analysis/geometry/test__extract_relevant_cube_slice.py b/lib/iris/tests/unit/analysis/geometry/test__extract_relevant_cube_slice.py
index 2509ac1a92..bec45d8b17 100644
--- a/lib/iris/tests/unit/analysis/geometry/test__extract_relevant_cube_slice.py
+++ b/lib/iris/tests/unit/analysis/geometry/test__extract_relevant_cube_slice.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for :func:`iris.analysis.geometry._extract_relevant_cube_slice`.
 
diff --git a/lib/iris/tests/unit/analysis/geometry/test_geometry_area_weights.py b/lib/iris/tests/unit/analysis/geometry/test_geometry_area_weights.py
index 62ab1ae283..ae0e47292d 100644
--- a/lib/iris/tests/unit/analysis/geometry/test_geometry_area_weights.py
+++ b/lib/iris/tests/unit/analysis/geometry/test_geometry_area_weights.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :func:`iris.analysis.geometry.geometry_area_weights`
 function.
diff --git a/lib/iris/tests/unit/analysis/interpolation/__init__.py b/lib/iris/tests/unit/analysis/interpolation/__init__.py
index 3825dacda3..01208c1aba 100644
--- a/lib/iris/tests/unit/analysis/interpolation/__init__.py
+++ b/lib/iris/tests/unit/analysis/interpolation/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.analysis._interpolation` package."""
diff --git a/lib/iris/tests/unit/analysis/interpolation/test_RectilinearInterpolator.py b/lib/iris/tests/unit/analysis/interpolation/test_RectilinearInterpolator.py
index a91a08dcb8..574a25ee7d 100644
--- a/lib/iris/tests/unit/analysis/interpolation/test_RectilinearInterpolator.py
+++ b/lib/iris/tests/unit/analysis/interpolation/test_RectilinearInterpolator.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for :class:`iris.analysis._interpolation.RectilinearInterpolator`.
 
diff --git a/lib/iris/tests/unit/analysis/interpolation/test_get_xy_dim_coords.py b/lib/iris/tests/unit/analysis/interpolation/test_get_xy_dim_coords.py
index 54e54bc304..26bc32c69f 100644
--- a/lib/iris/tests/unit/analysis/interpolation/test_get_xy_dim_coords.py
+++ b/lib/iris/tests/unit/analysis/interpolation/test_get_xy_dim_coords.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for :func:`iris.analysis._interpolation.get_xy_dim_coords`.
 
diff --git a/lib/iris/tests/unit/analysis/maths/__init__.py b/lib/iris/tests/unit/analysis/maths/__init__.py
index c259bdeff6..c77f8ede37 100644
--- a/lib/iris/tests/unit/analysis/maths/__init__.py
+++ b/lib/iris/tests/unit/analysis/maths/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.analysis.maths` module."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/maths/test__arith__dask_array.py b/lib/iris/tests/unit/analysis/maths/test__arith__dask_array.py
index 11664af115..17c0aeac15 100644
--- a/lib/iris/tests/unit/analysis/maths/test__arith__dask_array.py
+++ b/lib/iris/tests/unit/analysis/maths/test__arith__dask_array.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for cube arithmetic with dask arrays."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/maths/test__arith__derived_coords.py b/lib/iris/tests/unit/analysis/maths/test__arith__derived_coords.py
index 57e012e1c9..85d1c363e6 100644
--- a/lib/iris/tests/unit/analysis/maths/test__arith__derived_coords.py
+++ b/lib/iris/tests/unit/analysis/maths/test__arith__derived_coords.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for cube arithmetic involving derived (i.e. factory) coords."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/maths/test__arith__meshcoords.py b/lib/iris/tests/unit/analysis/maths/test__arith__meshcoords.py
index e1255ef9d8..c55d19f000 100644
--- a/lib/iris/tests/unit/analysis/maths/test__arith__meshcoords.py
+++ b/lib/iris/tests/unit/analysis/maths/test__arith__meshcoords.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for cube arithmetic involving MeshCoords."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/maths/test__get_dtype.py b/lib/iris/tests/unit/analysis/maths/test__get_dtype.py
index 220b728b32..81cfdee3fb 100644
--- a/lib/iris/tests/unit/analysis/maths/test__get_dtype.py
+++ b/lib/iris/tests/unit/analysis/maths/test__get_dtype.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the function :func:`iris.analysis.maths._get_dtype`.
 
diff --git a/lib/iris/tests/unit/analysis/maths/test__inplace_common_checks.py b/lib/iris/tests/unit/analysis/maths/test__inplace_common_checks.py
index bd81a96fbd..2c97737973 100644
--- a/lib/iris/tests/unit/analysis/maths/test__inplace_common_checks.py
+++ b/lib/iris/tests/unit/analysis/maths/test__inplace_common_checks.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the function :func:`iris.analysis.maths._inplace_common_checks`.
 
diff --git a/lib/iris/tests/unit/analysis/maths/test__output_dtype.py b/lib/iris/tests/unit/analysis/maths/test__output_dtype.py
index c422e366be..3f69118e0f 100644
--- a/lib/iris/tests/unit/analysis/maths/test__output_dtype.py
+++ b/lib/iris/tests/unit/analysis/maths/test__output_dtype.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the function :func:`iris.analysis.maths._output_dtype`.
 
diff --git a/lib/iris/tests/unit/analysis/maths/test_add.py b/lib/iris/tests/unit/analysis/maths/test_add.py
index 1ca7f7c244..69078b9a96 100644
--- a/lib/iris/tests/unit/analysis/maths/test_add.py
+++ b/lib/iris/tests/unit/analysis/maths/test_add.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :func:`iris.analysis.maths.add` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/maths/test_divide.py b/lib/iris/tests/unit/analysis/maths/test_divide.py
index 4bd202e037..17e5105126 100644
--- a/lib/iris/tests/unit/analysis/maths/test_divide.py
+++ b/lib/iris/tests/unit/analysis/maths/test_divide.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :func:`iris.analysis.maths.divide` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/maths/test_multiply.py b/lib/iris/tests/unit/analysis/maths/test_multiply.py
index 266342605a..945a86a4d1 100644
--- a/lib/iris/tests/unit/analysis/maths/test_multiply.py
+++ b/lib/iris/tests/unit/analysis/maths/test_multiply.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :func:`iris.analysis.maths.multiply` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/maths/test_subtract.py b/lib/iris/tests/unit/analysis/maths/test_subtract.py
index f7a9df34d0..6812176412 100644
--- a/lib/iris/tests/unit/analysis/maths/test_subtract.py
+++ b/lib/iris/tests/unit/analysis/maths/test_subtract.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :func:`iris.analysis.maths.subtract` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/regrid/__init__.py b/lib/iris/tests/unit/analysis/regrid/__init__.py
index a0a0fd0a6b..c4e5c119ea 100644
--- a/lib/iris/tests/unit/analysis/regrid/__init__.py
+++ b/lib/iris/tests/unit/analysis/regrid/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.analysis._regrid` module."""
diff --git a/lib/iris/tests/unit/analysis/regrid/test_RectilinearRegridder.py b/lib/iris/tests/unit/analysis/regrid/test_RectilinearRegridder.py
index a018507fb3..4855b92332 100644
--- a/lib/iris/tests/unit/analysis/regrid/test_RectilinearRegridder.py
+++ b/lib/iris/tests/unit/analysis/regrid/test_RectilinearRegridder.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :class:`iris.analysis._regrid.RectilinearRegridder`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/regrid/test__CurvilinearRegridder.py b/lib/iris/tests/unit/analysis/regrid/test__CurvilinearRegridder.py
index 9b0160aee4..16639c1649 100644
--- a/lib/iris/tests/unit/analysis/regrid/test__CurvilinearRegridder.py
+++ b/lib/iris/tests/unit/analysis/regrid/test__CurvilinearRegridder.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :class:`iris.analysis._regrid.CurvilinearRegridder`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/scipy_interpolate/__init__.py b/lib/iris/tests/unit/analysis/scipy_interpolate/__init__.py
index 67218194c2..cd80f89470 100644
--- a/lib/iris/tests/unit/analysis/scipy_interpolate/__init__.py
+++ b/lib/iris/tests/unit/analysis/scipy_interpolate/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.analysis.scipy_interpolate` module."""
diff --git a/lib/iris/tests/unit/analysis/scipy_interpolate/test__RegularGridInterpolator.py b/lib/iris/tests/unit/analysis/scipy_interpolate/test__RegularGridInterpolator.py
index f0aa027baa..9bf9621fb4 100644
--- a/lib/iris/tests/unit/analysis/scipy_interpolate/test__RegularGridInterpolator.py
+++ b/lib/iris/tests/unit/analysis/scipy_interpolate/test__RegularGridInterpolator.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the
 :func:`iris.analysis._scipy_interpolate._RegularGridInterpolator` class."""
 
diff --git a/lib/iris/tests/unit/analysis/stats/__init__.py b/lib/iris/tests/unit/analysis/stats/__init__.py
index 0b896d648d..8787858158 100644
--- a/lib/iris/tests/unit/analysis/stats/__init__.py
+++ b/lib/iris/tests/unit/analysis/stats/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.analysis.stats` module."""
diff --git a/lib/iris/tests/unit/analysis/stats/test_pearsonr.py b/lib/iris/tests/unit/analysis/stats/test_pearsonr.py
index 63cf4e2abe..648aeb8a64 100644
--- a/lib/iris/tests/unit/analysis/stats/test_pearsonr.py
+++ b/lib/iris/tests/unit/analysis/stats/test_pearsonr.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.analysis.stats.pearsonr` function."""
 
 # Import iris tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/test_Aggregator.py b/lib/iris/tests/unit/analysis/test_Aggregator.py
index 45081ad07f..a7029d7d33 100644
--- a/lib/iris/tests/unit/analysis/test_Aggregator.py
+++ b/lib/iris/tests/unit/analysis/test_Aggregator.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.analysis.Aggregator` class instance."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/test_AreaWeighted.py b/lib/iris/tests/unit/analysis/test_AreaWeighted.py
index 2454e0817c..1e16e4bcb2 100644
--- a/lib/iris/tests/unit/analysis/test_AreaWeighted.py
+++ b/lib/iris/tests/unit/analysis/test_AreaWeighted.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :class:`iris.analysis.AreaWeighted`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/test_COUNT.py b/lib/iris/tests/unit/analysis/test_COUNT.py
index 96274f7cd0..fa51565474 100644
--- a/lib/iris/tests/unit/analysis/test_COUNT.py
+++ b/lib/iris/tests/unit/analysis/test_COUNT.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :data:`iris.analysis.COUNT` aggregator."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/test_Linear.py b/lib/iris/tests/unit/analysis/test_Linear.py
index 27565f8c51..e98a6f585e 100644
--- a/lib/iris/tests/unit/analysis/test_Linear.py
+++ b/lib/iris/tests/unit/analysis/test_Linear.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :class:`iris.analysis.Linear`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/test_MAX.py b/lib/iris/tests/unit/analysis/test_MAX.py
index 91d4daf1f0..8753c5e660 100644
--- a/lib/iris/tests/unit/analysis/test_MAX.py
+++ b/lib/iris/tests/unit/analysis/test_MAX.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :data:`iris.analysis.MAX` aggregator."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/test_MAX_RUN.py b/lib/iris/tests/unit/analysis/test_MAX_RUN.py
index 00de383f7a..13a940f6fa 100755
--- a/lib/iris/tests/unit/analysis/test_MAX_RUN.py
+++ b/lib/iris/tests/unit/analysis/test_MAX_RUN.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :data:`iris.analysis.MAX_RUN` aggregator."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/test_MEAN.py b/lib/iris/tests/unit/analysis/test_MEAN.py
index 18e2b4ca6c..9b8ccc1aa7 100644
--- a/lib/iris/tests/unit/analysis/test_MEAN.py
+++ b/lib/iris/tests/unit/analysis/test_MEAN.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :data:`iris.analysis.MEAN` aggregator."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/test_MIN.py b/lib/iris/tests/unit/analysis/test_MIN.py
index f12790f0f1..06757517d3 100644
--- a/lib/iris/tests/unit/analysis/test_MIN.py
+++ b/lib/iris/tests/unit/analysis/test_MIN.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :data:`iris.analysis.MIN` aggregator."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/test_Nearest.py b/lib/iris/tests/unit/analysis/test_Nearest.py
index f3736d2cf3..053fca1907 100644
--- a/lib/iris/tests/unit/analysis/test_Nearest.py
+++ b/lib/iris/tests/unit/analysis/test_Nearest.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :class:`iris.analysis.Nearest`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/test_PERCENTILE.py b/lib/iris/tests/unit/analysis/test_PERCENTILE.py
index a29516c604..d841619ccc 100644
--- a/lib/iris/tests/unit/analysis/test_PERCENTILE.py
+++ b/lib/iris/tests/unit/analysis/test_PERCENTILE.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :data:`iris.analysis.PERCENTILE` aggregator."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/test_PROPORTION.py b/lib/iris/tests/unit/analysis/test_PROPORTION.py
index b7118241af..dc890463ae 100644
--- a/lib/iris/tests/unit/analysis/test_PROPORTION.py
+++ b/lib/iris/tests/unit/analysis/test_PROPORTION.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :data:`iris.analysis.PROPORTION` aggregator."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/test_PercentileAggregator.py b/lib/iris/tests/unit/analysis/test_PercentileAggregator.py
index f11cd7a8d3..0137a50019 100644
--- a/lib/iris/tests/unit/analysis/test_PercentileAggregator.py
+++ b/lib/iris/tests/unit/analysis/test_PercentileAggregator.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.analysis.PercentileAggregator` class instance.
 
diff --git a/lib/iris/tests/unit/analysis/test_PointInCell.py b/lib/iris/tests/unit/analysis/test_PointInCell.py
index 2570465245..83453c26d1 100644
--- a/lib/iris/tests/unit/analysis/test_PointInCell.py
+++ b/lib/iris/tests/unit/analysis/test_PointInCell.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :class:`iris.analysis.PointInCell`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/test_RMS.py b/lib/iris/tests/unit/analysis/test_RMS.py
index 74f309ce00..f5da089a9c 100644
--- a/lib/iris/tests/unit/analysis/test_RMS.py
+++ b/lib/iris/tests/unit/analysis/test_RMS.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :data:`iris.analysis.RMS` aggregator."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/test_STD_DEV.py b/lib/iris/tests/unit/analysis/test_STD_DEV.py
index 978bdb4ddf..0abf4f9dc3 100644
--- a/lib/iris/tests/unit/analysis/test_STD_DEV.py
+++ b/lib/iris/tests/unit/analysis/test_STD_DEV.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :data:`iris.analysis.STD_DEV` aggregator."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/test_SUM.py b/lib/iris/tests/unit/analysis/test_SUM.py
index 64699b442f..90be890797 100644
--- a/lib/iris/tests/unit/analysis/test_SUM.py
+++ b/lib/iris/tests/unit/analysis/test_SUM.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :data:`iris.analysis.SUM` aggregator."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/test_VARIANCE.py b/lib/iris/tests/unit/analysis/test_VARIANCE.py
index 857bc7e1d2..e4dde970a9 100644
--- a/lib/iris/tests/unit/analysis/test_VARIANCE.py
+++ b/lib/iris/tests/unit/analysis/test_VARIANCE.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :data:`iris.analysis.VARIANCE` aggregator."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/test_WPERCENTILE.py b/lib/iris/tests/unit/analysis/test_WPERCENTILE.py
index a59bf4ce9c..c8bcf5018e 100644
--- a/lib/iris/tests/unit/analysis/test_WPERCENTILE.py
+++ b/lib/iris/tests/unit/analysis/test_WPERCENTILE.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :data:`iris.analysis.PERCENTILE` aggregator."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/test_WeightedPercentileAggregator.py b/lib/iris/tests/unit/analysis/test_WeightedPercentileAggregator.py
index 0cd808d1c7..a1306063b6 100644
--- a/lib/iris/tests/unit/analysis/test_WeightedPercentileAggregator.py
+++ b/lib/iris/tests/unit/analysis/test_WeightedPercentileAggregator.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.analysis.PercentileAggregator` class instance.
 
diff --git a/lib/iris/tests/unit/analysis/test__axis_to_single_trailing.py b/lib/iris/tests/unit/analysis/test__axis_to_single_trailing.py
index 505a00df78..f4cb94f466 100644
--- a/lib/iris/tests/unit/analysis/test__axis_to_single_trailing.py
+++ b/lib/iris/tests/unit/analysis/test__axis_to_single_trailing.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :data:`iris.analysis._axis_to_single_trailing` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/analysis/trajectory/__init__.py b/lib/iris/tests/unit/analysis/trajectory/__init__.py
index 55d3ebd8bc..8033fd8c30 100644
--- a/lib/iris/tests/unit/analysis/trajectory/__init__.py
+++ b/lib/iris/tests/unit/analysis/trajectory/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.analysis.trajectory` module."""
diff --git a/lib/iris/tests/unit/analysis/trajectory/test_Trajectory.py b/lib/iris/tests/unit/analysis/trajectory/test_Trajectory.py
index 32c41b78db..c8971a897e 100644
--- a/lib/iris/tests/unit/analysis/trajectory/test_Trajectory.py
+++ b/lib/iris/tests/unit/analysis/trajectory/test_Trajectory.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for :class:`iris.analysis.trajectory.Trajectory`.
 
diff --git a/lib/iris/tests/unit/analysis/trajectory/test_UnstructuredNearestNeighbourRegridder.py b/lib/iris/tests/unit/analysis/trajectory/test_UnstructuredNearestNeighbourRegridder.py
index a652ceb72e..f70c3e7518 100644
--- a/lib/iris/tests/unit/analysis/trajectory/test_UnstructuredNearestNeighbourRegridder.py
+++ b/lib/iris/tests/unit/analysis/trajectory/test_UnstructuredNearestNeighbourRegridder.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for
 :class:`iris.analysis.trajectory.UnstructuredNearestNeigbourRegridder`.
diff --git a/lib/iris/tests/unit/analysis/trajectory/test__nearest_neighbour_indices_ndcoords.py b/lib/iris/tests/unit/analysis/trajectory/test__nearest_neighbour_indices_ndcoords.py
index 8b9e4cafa4..d30feecadd 100644
--- a/lib/iris/tests/unit/analysis/trajectory/test__nearest_neighbour_indices_ndcoords.py
+++ b/lib/iris/tests/unit/analysis/trajectory/test__nearest_neighbour_indices_ndcoords.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for
 :meth:`iris.analysis.trajectory._nearest_neighbour_indices_ndcoords`.
diff --git a/lib/iris/tests/unit/analysis/trajectory/test_interpolate.py b/lib/iris/tests/unit/analysis/trajectory/test_interpolate.py
index f1b9711068..c156354f8f 100644
--- a/lib/iris/tests/unit/analysis/trajectory/test_interpolate.py
+++ b/lib/iris/tests/unit/analysis/trajectory/test_interpolate.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for :meth:`iris.analysis.trajectory.interpolate`.
 
diff --git a/lib/iris/tests/unit/aux_factory/__init__.py b/lib/iris/tests/unit/aux_factory/__init__.py
index 00b9f1a3bd..621625e9da 100644
--- a/lib/iris/tests/unit/aux_factory/__init__.py
+++ b/lib/iris/tests/unit/aux_factory/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.aux_factory` module."""
diff --git a/lib/iris/tests/unit/aux_factory/test_AtmosphereSigmaFactory.py b/lib/iris/tests/unit/aux_factory/test_AtmosphereSigmaFactory.py
index 6e417a3b38..88da4ca463 100644
--- a/lib/iris/tests/unit/aux_factory/test_AtmosphereSigmaFactory.py
+++ b/lib/iris/tests/unit/aux_factory/test_AtmosphereSigmaFactory.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the
 `iris.aux_factory.AtmosphereSigmaFactory` class.
diff --git a/lib/iris/tests/unit/aux_factory/test_AuxCoordFactory.py b/lib/iris/tests/unit/aux_factory/test_AuxCoordFactory.py
index f8bd54093f..619a0482b6 100644
--- a/lib/iris/tests/unit/aux_factory/test_AuxCoordFactory.py
+++ b/lib/iris/tests/unit/aux_factory/test_AuxCoordFactory.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for `iris.aux_factory.AuxCoordFactory`.
 
diff --git a/lib/iris/tests/unit/aux_factory/test_HybridPressureFactory.py b/lib/iris/tests/unit/aux_factory/test_HybridPressureFactory.py
index 48fead3aa5..31f791f10e 100644
--- a/lib/iris/tests/unit/aux_factory/test_HybridPressureFactory.py
+++ b/lib/iris/tests/unit/aux_factory/test_HybridPressureFactory.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the
 `iris.aux_factory.HybridPressureFactory` class.
diff --git a/lib/iris/tests/unit/aux_factory/test_OceanSFactory.py b/lib/iris/tests/unit/aux_factory/test_OceanSFactory.py
index f588c9f001..4bd85d1e3b 100644
--- a/lib/iris/tests/unit/aux_factory/test_OceanSFactory.py
+++ b/lib/iris/tests/unit/aux_factory/test_OceanSFactory.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the
 `iris.aux_factory.OceanSFactory` class.
diff --git a/lib/iris/tests/unit/aux_factory/test_OceanSg1Factory.py b/lib/iris/tests/unit/aux_factory/test_OceanSg1Factory.py
index 7a2f4c631c..349b4cfcb6 100644
--- a/lib/iris/tests/unit/aux_factory/test_OceanSg1Factory.py
+++ b/lib/iris/tests/unit/aux_factory/test_OceanSg1Factory.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the
 `iris.aux_factory.OceanSg1Factory` class.
diff --git a/lib/iris/tests/unit/aux_factory/test_OceanSg2Factory.py b/lib/iris/tests/unit/aux_factory/test_OceanSg2Factory.py
index 4d1f268a1e..3304cf121d 100644
--- a/lib/iris/tests/unit/aux_factory/test_OceanSg2Factory.py
+++ b/lib/iris/tests/unit/aux_factory/test_OceanSg2Factory.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the
 `iris.aux_factory.OceanSg2Factory` class.
diff --git a/lib/iris/tests/unit/aux_factory/test_OceanSigmaFactory.py b/lib/iris/tests/unit/aux_factory/test_OceanSigmaFactory.py
index 30d9647952..a03afa661d 100644
--- a/lib/iris/tests/unit/aux_factory/test_OceanSigmaFactory.py
+++ b/lib/iris/tests/unit/aux_factory/test_OceanSigmaFactory.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the
 `iris.aux_factory.OceanSigmaFactory` class.
diff --git a/lib/iris/tests/unit/aux_factory/test_OceanSigmaZFactory.py b/lib/iris/tests/unit/aux_factory/test_OceanSigmaZFactory.py
index 736a883846..a191fac978 100644
--- a/lib/iris/tests/unit/aux_factory/test_OceanSigmaZFactory.py
+++ b/lib/iris/tests/unit/aux_factory/test_OceanSigmaZFactory.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the
 `iris.aux_factory.OceanSigmaZFactory` class.
diff --git a/lib/iris/tests/unit/common/__init__.py b/lib/iris/tests/unit/common/__init__.py
index 5380785042..60d8548652 100644
--- a/lib/iris/tests/unit/common/__init__.py
+++ b/lib/iris/tests/unit/common/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.common` module."""
diff --git a/lib/iris/tests/unit/common/lenient/__init__.py b/lib/iris/tests/unit/common/lenient/__init__.py
index 2a99e7a4c2..e927f5f3ac 100644
--- a/lib/iris/tests/unit/common/lenient/__init__.py
+++ b/lib/iris/tests/unit/common/lenient/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.common.lenient` package."""
diff --git a/lib/iris/tests/unit/common/lenient/test_Lenient.py b/lib/iris/tests/unit/common/lenient/test_Lenient.py
index 62e2b24891..6bcf366a25 100644
--- a/lib/iris/tests/unit/common/lenient/test_Lenient.py
+++ b/lib/iris/tests/unit/common/lenient/test_Lenient.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.common.lenient.Lenient`.
 
diff --git a/lib/iris/tests/unit/common/lenient/test__Lenient.py b/lib/iris/tests/unit/common/lenient/test__Lenient.py
index 44f38d9c5a..9bff110942 100644
--- a/lib/iris/tests/unit/common/lenient/test__Lenient.py
+++ b/lib/iris/tests/unit/common/lenient/test__Lenient.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.common.lenient._Lenient`.
 
diff --git a/lib/iris/tests/unit/common/lenient/test__lenient_client.py b/lib/iris/tests/unit/common/lenient/test__lenient_client.py
index 3a19563efc..b604e49608 100644
--- a/lib/iris/tests/unit/common/lenient/test__lenient_client.py
+++ b/lib/iris/tests/unit/common/lenient/test__lenient_client.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :func:`iris.common.lenient._lenient_client`.
 
diff --git a/lib/iris/tests/unit/common/lenient/test__lenient_service.py b/lib/iris/tests/unit/common/lenient/test__lenient_service.py
index 9545b137ea..f6bafde5e7 100644
--- a/lib/iris/tests/unit/common/lenient/test__lenient_service.py
+++ b/lib/iris/tests/unit/common/lenient/test__lenient_service.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :func:`iris.common.lenient._lenient_service`.
 
diff --git a/lib/iris/tests/unit/common/lenient/test__qualname.py b/lib/iris/tests/unit/common/lenient/test__qualname.py
index 3deefbf30d..6e2eb23bc6 100644
--- a/lib/iris/tests/unit/common/lenient/test__qualname.py
+++ b/lib/iris/tests/unit/common/lenient/test__qualname.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :func:`iris.common.lenient._qualname`.
 
diff --git a/lib/iris/tests/unit/common/metadata/__init__.py b/lib/iris/tests/unit/common/metadata/__init__.py
index aba33c8312..973234fb21 100644
--- a/lib/iris/tests/unit/common/metadata/__init__.py
+++ b/lib/iris/tests/unit/common/metadata/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.common.metadata` package."""
diff --git a/lib/iris/tests/unit/common/metadata/test_AncillaryVariableMetadata.py b/lib/iris/tests/unit/common/metadata/test_AncillaryVariableMetadata.py
index 9efb43ec42..196ab48d20 100644
--- a/lib/iris/tests/unit/common/metadata/test_AncillaryVariableMetadata.py
+++ b/lib/iris/tests/unit/common/metadata/test_AncillaryVariableMetadata.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.common.metadata.AncillaryVariableMetadata`.
 
diff --git a/lib/iris/tests/unit/common/metadata/test_BaseMetadata.py b/lib/iris/tests/unit/common/metadata/test_BaseMetadata.py
index f4760b3051..e7434922cf 100644
--- a/lib/iris/tests/unit/common/metadata/test_BaseMetadata.py
+++ b/lib/iris/tests/unit/common/metadata/test_BaseMetadata.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.common.metadata.BaseMetadata`.
 
diff --git a/lib/iris/tests/unit/common/metadata/test_CellMeasureMetadata.py b/lib/iris/tests/unit/common/metadata/test_CellMeasureMetadata.py
index a434651206..25b287909d 100644
--- a/lib/iris/tests/unit/common/metadata/test_CellMeasureMetadata.py
+++ b/lib/iris/tests/unit/common/metadata/test_CellMeasureMetadata.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.common.metadata.CellMeasureMetadata`.
 
diff --git a/lib/iris/tests/unit/common/metadata/test_CoordMetadata.py b/lib/iris/tests/unit/common/metadata/test_CoordMetadata.py
index e3b7486012..dac1f26f35 100644
--- a/lib/iris/tests/unit/common/metadata/test_CoordMetadata.py
+++ b/lib/iris/tests/unit/common/metadata/test_CoordMetadata.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.common.metadata.CoordMetadata`.
 
diff --git a/lib/iris/tests/unit/common/metadata/test_CubeMetadata.py b/lib/iris/tests/unit/common/metadata/test_CubeMetadata.py
index 848431565b..382607dca5 100644
--- a/lib/iris/tests/unit/common/metadata/test_CubeMetadata.py
+++ b/lib/iris/tests/unit/common/metadata/test_CubeMetadata.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.common.metadata.CubeMetadata`.
 
diff --git a/lib/iris/tests/unit/common/metadata/test__NamedTupleMeta.py b/lib/iris/tests/unit/common/metadata/test__NamedTupleMeta.py
index 155c4f99b8..1608b1c42e 100644
--- a/lib/iris/tests/unit/common/metadata/test__NamedTupleMeta.py
+++ b/lib/iris/tests/unit/common/metadata/test__NamedTupleMeta.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.common.metadata._NamedTupleMeta`.
 
diff --git a/lib/iris/tests/unit/common/metadata/test_hexdigest.py b/lib/iris/tests/unit/common/metadata/test_hexdigest.py
index 949002af89..9a16d9252b 100644
--- a/lib/iris/tests/unit/common/metadata/test_hexdigest.py
+++ b/lib/iris/tests/unit/common/metadata/test_hexdigest.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :func:`iris.common.metadata.hexdigest`.
 
diff --git a/lib/iris/tests/unit/common/metadata/test_metadata_filter.py b/lib/iris/tests/unit/common/metadata/test_metadata_filter.py
index 9c5987f235..340b6a5355 100644
--- a/lib/iris/tests/unit/common/metadata/test_metadata_filter.py
+++ b/lib/iris/tests/unit/common/metadata/test_metadata_filter.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :func:`iris.common.metadata_filter`.
 
diff --git a/lib/iris/tests/unit/common/metadata/test_metadata_manager_factory.py b/lib/iris/tests/unit/common/metadata/test_metadata_manager_factory.py
index cbb29b7161..1bf342004d 100644
--- a/lib/iris/tests/unit/common/metadata/test_metadata_manager_factory.py
+++ b/lib/iris/tests/unit/common/metadata/test_metadata_manager_factory.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :func:`iris.common.metadata.metadata_manager_factory`.
 
diff --git a/lib/iris/tests/unit/common/mixin/__init__.py b/lib/iris/tests/unit/common/mixin/__init__.py
index 493e140626..3c1f5bbc9d 100644
--- a/lib/iris/tests/unit/common/mixin/__init__.py
+++ b/lib/iris/tests/unit/common/mixin/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.common.mixin` package."""
diff --git a/lib/iris/tests/unit/common/mixin/test_CFVariableMixin.py b/lib/iris/tests/unit/common/mixin/test_CFVariableMixin.py
index 88a88be567..55d2ca5d79 100644
--- a/lib/iris/tests/unit/common/mixin/test_CFVariableMixin.py
+++ b/lib/iris/tests/unit/common/mixin/test_CFVariableMixin.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.common.mixin.CFVariableMixin`.
 
diff --git a/lib/iris/tests/unit/common/mixin/test_LimitedAttributeDict.py b/lib/iris/tests/unit/common/mixin/test_LimitedAttributeDict.py
index 32c78b6697..7416bb9da5 100644
--- a/lib/iris/tests/unit/common/mixin/test_LimitedAttributeDict.py
+++ b/lib/iris/tests/unit/common/mixin/test_LimitedAttributeDict.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.common.mixin.LimitedAttributeDict`.
 
diff --git a/lib/iris/tests/unit/common/mixin/test__get_valid_standard_name.py b/lib/iris/tests/unit/common/mixin/test__get_valid_standard_name.py
index 8fc21f2965..634eae4cf3 100644
--- a/lib/iris/tests/unit/common/mixin/test__get_valid_standard_name.py
+++ b/lib/iris/tests/unit/common/mixin/test__get_valid_standard_name.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :func:`iris.common.mixin._get_valid_standard_name`.
 
diff --git a/lib/iris/tests/unit/common/resolve/__init__.py b/lib/iris/tests/unit/common/resolve/__init__.py
index d0b189e59d..8bfbe20970 100644
--- a/lib/iris/tests/unit/common/resolve/__init__.py
+++ b/lib/iris/tests/unit/common/resolve/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.common.resolve` package."""
diff --git a/lib/iris/tests/unit/common/resolve/test_Resolve.py b/lib/iris/tests/unit/common/resolve/test_Resolve.py
index db1759c5fc..182cbbd61c 100644
--- a/lib/iris/tests/unit/common/resolve/test_Resolve.py
+++ b/lib/iris/tests/unit/common/resolve/test_Resolve.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.common.resolve.Resolve`.
 
diff --git a/lib/iris/tests/unit/concatenate/__init__.py b/lib/iris/tests/unit/concatenate/__init__.py
index 229476f3a6..6deaf26aa0 100644
--- a/lib/iris/tests/unit/concatenate/__init__.py
+++ b/lib/iris/tests/unit/concatenate/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit-test infrastructure for the :mod:`iris._concatenate` package."""
 
 from __future__ import annotations
diff --git a/lib/iris/tests/unit/concatenate/test__CoordMetaData.py b/lib/iris/tests/unit/concatenate/test__CoordMetaData.py
index 6f29e1f65f..35c3cfd17b 100644
--- a/lib/iris/tests/unit/concatenate/test__CoordMetaData.py
+++ b/lib/iris/tests/unit/concatenate/test__CoordMetaData.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit-tests for :class:`iris._concatenate._CoordMetaData`."""
 
 from __future__ import annotations
diff --git a/lib/iris/tests/unit/concatenate/test__CoordSignature.py b/lib/iris/tests/unit/concatenate/test__CoordSignature.py
index eb62c5ec64..c5e4850170 100644
--- a/lib/iris/tests/unit/concatenate/test__CoordSignature.py
+++ b/lib/iris/tests/unit/concatenate/test__CoordSignature.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit-tests for :class:`iris._concatenate._CoordSignature`."""
 
 from __future__ import annotations
diff --git a/lib/iris/tests/unit/concatenate/test__CubeSignature.py b/lib/iris/tests/unit/concatenate/test__CubeSignature.py
index cc20cdfa1f..64a25a2fad 100644
--- a/lib/iris/tests/unit/concatenate/test__CubeSignature.py
+++ b/lib/iris/tests/unit/concatenate/test__CubeSignature.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test class :class:`iris._concatenate._CubeSignature`."""
 
 # import iris tests first so that some things can be initialised
diff --git a/lib/iris/tests/unit/concatenate/test_concatenate.py b/lib/iris/tests/unit/concatenate/test_concatenate.py
index c2ca01f781..96932e11d4 100644
--- a/lib/iris/tests/unit/concatenate/test_concatenate.py
+++ b/lib/iris/tests/unit/concatenate/test_concatenate.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris._concatenate.concatenate.py`."""
 
 # import iris tests first so that some things can be initialised
diff --git a/lib/iris/tests/unit/config/__init__.py b/lib/iris/tests/unit/config/__init__.py
index 38806c7db8..07805d4bd7 100644
--- a/lib/iris/tests/unit/config/__init__.py
+++ b/lib/iris/tests/unit/config/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.config` module."""
diff --git a/lib/iris/tests/unit/config/test_NetCDF.py b/lib/iris/tests/unit/config/test_NetCDF.py
index c7f7564e4e..5b691a1dc3 100644
--- a/lib/iris/tests/unit/config/test_NetCDF.py
+++ b/lib/iris/tests/unit/config/test_NetCDF.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.config.NetCDF` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/constraints/__init__.py b/lib/iris/tests/unit/constraints/__init__.py
index 03a987b1a1..987e88c6e7 100644
--- a/lib/iris/tests/unit/constraints/__init__.py
+++ b/lib/iris/tests/unit/constraints/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris._constraints` module."""
diff --git a/lib/iris/tests/unit/constraints/test_Constraint_equality.py b/lib/iris/tests/unit/constraints/test_Constraint_equality.py
index 01e61b70a7..6e0b37c3f4 100644
--- a/lib/iris/tests/unit/constraints/test_Constraint_equality.py
+++ b/lib/iris/tests/unit/constraints/test_Constraint_equality.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for equality testing of different constraint types."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/constraints/test_NameConstraint.py b/lib/iris/tests/unit/constraints/test_NameConstraint.py
index 46aea25331..b959b82434 100644
--- a/lib/iris/tests/unit/constraints/test_NameConstraint.py
+++ b/lib/iris/tests/unit/constraints/test_NameConstraint.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris._constraints.NameConstraint` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/coord_categorisation/__init__.py b/lib/iris/tests/unit/coord_categorisation/__init__.py
index 18fe8f2482..9c60613915 100644
--- a/lib/iris/tests/unit/coord_categorisation/__init__.py
+++ b/lib/iris/tests/unit/coord_categorisation/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.coord_categorisation` module."""
diff --git a/lib/iris/tests/unit/coord_categorisation/test_add_categorised_coord.py b/lib/iris/tests/unit/coord_categorisation/test_add_categorised_coord.py
index 0c20f16f5a..2291e677bc 100644
--- a/lib/iris/tests/unit/coord_categorisation/test_add_categorised_coord.py
+++ b/lib/iris/tests/unit/coord_categorisation/test_add_categorised_coord.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris.coord_categorisation.add_categorised_coord`."""
 
 # import iris tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/coord_categorisation/test_add_hour.py b/lib/iris/tests/unit/coord_categorisation/test_add_hour.py
index 418ac72557..caf52e9c84 100644
--- a/lib/iris/tests/unit/coord_categorisation/test_add_hour.py
+++ b/lib/iris/tests/unit/coord_categorisation/test_add_hour.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test coordinate categorisation function add_hour.
 """
diff --git a/lib/iris/tests/unit/coord_categorisation/test_coord_categorisation.py b/lib/iris/tests/unit/coord_categorisation/test_coord_categorisation.py
index fbc3514147..6560f65a32 100644
--- a/lib/iris/tests/unit/coord_categorisation/test_coord_categorisation.py
+++ b/lib/iris/tests/unit/coord_categorisation/test_coord_categorisation.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test the coordinate categorisation functions.
 """
diff --git a/lib/iris/tests/unit/coord_systems/__init__.py b/lib/iris/tests/unit/coord_systems/__init__.py
index 39d4d25f73..21f703eed0 100644
--- a/lib/iris/tests/unit/coord_systems/__init__.py
+++ b/lib/iris/tests/unit/coord_systems/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.coord_systems` module."""
diff --git a/lib/iris/tests/unit/coord_systems/test_AlbersEqualArea.py b/lib/iris/tests/unit/coord_systems/test_AlbersEqualArea.py
index 99a7c9f59b..26aa79ac47 100644
--- a/lib/iris/tests/unit/coord_systems/test_AlbersEqualArea.py
+++ b/lib/iris/tests/unit/coord_systems/test_AlbersEqualArea.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.coord_systems.AlbersEqualArea` class.
 
diff --git a/lib/iris/tests/unit/coord_systems/test_GeogCS.py b/lib/iris/tests/unit/coord_systems/test_GeogCS.py
index f3f9531dbb..acb9029b1e 100644
--- a/lib/iris/tests/unit/coord_systems/test_GeogCS.py
+++ b/lib/iris/tests/unit/coord_systems/test_GeogCS.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.coord_systems.GeogCS` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/coord_systems/test_Geostationary.py b/lib/iris/tests/unit/coord_systems/test_Geostationary.py
index cc3c8384db..f144dca190 100644
--- a/lib/iris/tests/unit/coord_systems/test_Geostationary.py
+++ b/lib/iris/tests/unit/coord_systems/test_Geostationary.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.coord_systems.Geostationary` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/coord_systems/test_LambertAzimuthalEqualArea.py b/lib/iris/tests/unit/coord_systems/test_LambertAzimuthalEqualArea.py
index 971ee06293..b2d0c576bb 100644
--- a/lib/iris/tests/unit/coord_systems/test_LambertAzimuthalEqualArea.py
+++ b/lib/iris/tests/unit/coord_systems/test_LambertAzimuthalEqualArea.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.coord_systems.LambertAzimuthalEqualArea` class.
 
diff --git a/lib/iris/tests/unit/coord_systems/test_LambertConformal.py b/lib/iris/tests/unit/coord_systems/test_LambertConformal.py
index 7ba89208b1..a9bf70ef94 100644
--- a/lib/iris/tests/unit/coord_systems/test_LambertConformal.py
+++ b/lib/iris/tests/unit/coord_systems/test_LambertConformal.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.coord_systems.LambertConformal` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/coord_systems/test_Mercator.py b/lib/iris/tests/unit/coord_systems/test_Mercator.py
index ba04c77d57..dd2f42bb2f 100644
--- a/lib/iris/tests/unit/coord_systems/test_Mercator.py
+++ b/lib/iris/tests/unit/coord_systems/test_Mercator.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.coord_systems.Mercator` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/coord_systems/test_ObliqueMercator.py b/lib/iris/tests/unit/coord_systems/test_ObliqueMercator.py
index 0799fb881e..b17c1cc788 100644
--- a/lib/iris/tests/unit/coord_systems/test_ObliqueMercator.py
+++ b/lib/iris/tests/unit/coord_systems/test_ObliqueMercator.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.coord_systems.ObliqueMercator` class."""
 
 from typing import List, NamedTuple
diff --git a/lib/iris/tests/unit/coord_systems/test_Orthographic.py b/lib/iris/tests/unit/coord_systems/test_Orthographic.py
index ffcbecf55c..a2b63ad5fe 100644
--- a/lib/iris/tests/unit/coord_systems/test_Orthographic.py
+++ b/lib/iris/tests/unit/coord_systems/test_Orthographic.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.coord_systems.Orthographic` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/coord_systems/test_PolarStereographic.py b/lib/iris/tests/unit/coord_systems/test_PolarStereographic.py
index 25f5d24800..16f3ef2e7d 100755
--- a/lib/iris/tests/unit/coord_systems/test_PolarStereographic.py
+++ b/lib/iris/tests/unit/coord_systems/test_PolarStereographic.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.coord_systems.PolarStereographic` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/coord_systems/test_RotatedMercator.py b/lib/iris/tests/unit/coord_systems/test_RotatedMercator.py
index 97921efec6..01a0640d3b 100644
--- a/lib/iris/tests/unit/coord_systems/test_RotatedMercator.py
+++ b/lib/iris/tests/unit/coord_systems/test_RotatedMercator.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.coord_systems.RotatedMercator` class."""
 
 import pytest
diff --git a/lib/iris/tests/unit/coord_systems/test_RotatedPole.py b/lib/iris/tests/unit/coord_systems/test_RotatedPole.py
index dbb7a05bca..69408a96bc 100644
--- a/lib/iris/tests/unit/coord_systems/test_RotatedPole.py
+++ b/lib/iris/tests/unit/coord_systems/test_RotatedPole.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.coord_systems.RotatedPole` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/coord_systems/test_Stereographic.py b/lib/iris/tests/unit/coord_systems/test_Stereographic.py
index acd77112c1..cdc2fee581 100644
--- a/lib/iris/tests/unit/coord_systems/test_Stereographic.py
+++ b/lib/iris/tests/unit/coord_systems/test_Stereographic.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.coord_systems.Stereographic` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/coord_systems/test_TransverseMercator.py b/lib/iris/tests/unit/coord_systems/test_TransverseMercator.py
index 95b80333c2..526985e20d 100644
--- a/lib/iris/tests/unit/coord_systems/test_TransverseMercator.py
+++ b/lib/iris/tests/unit/coord_systems/test_TransverseMercator.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.coord_systems.TransverseMercator` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/coord_systems/test_VerticalPerspective.py b/lib/iris/tests/unit/coord_systems/test_VerticalPerspective.py
index 56498e40fa..4cd5f215a9 100644
--- a/lib/iris/tests/unit/coord_systems/test_VerticalPerspective.py
+++ b/lib/iris/tests/unit/coord_systems/test_VerticalPerspective.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.coord_systems.VerticalPerspective` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/coords/__init__.py b/lib/iris/tests/unit/coords/__init__.py
index 10cee9db8b..a99795d4da 100644
--- a/lib/iris/tests/unit/coords/__init__.py
+++ b/lib/iris/tests/unit/coords/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :mod:`iris.coords` module.
 
diff --git a/lib/iris/tests/unit/coords/test_AncillaryVariable.py b/lib/iris/tests/unit/coords/test_AncillaryVariable.py
index e5fc8fd28a..0177bcafc4 100644
--- a/lib/iris/tests/unit/coords/test_AncillaryVariable.py
+++ b/lib/iris/tests/unit/coords/test_AncillaryVariable.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.coords.AncillaryVariable` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/coords/test_AuxCoord.py b/lib/iris/tests/unit/coords/test_AuxCoord.py
index e5147659fc..31bd54eb12 100644
--- a/lib/iris/tests/unit/coords/test_AuxCoord.py
+++ b/lib/iris/tests/unit/coords/test_AuxCoord.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.coords.AuxCoord` class.
 
diff --git a/lib/iris/tests/unit/coords/test_Cell.py b/lib/iris/tests/unit/coords/test_Cell.py
index 2408ec9f36..b34ffdfb91 100644
--- a/lib/iris/tests/unit/coords/test_Cell.py
+++ b/lib/iris/tests/unit/coords/test_Cell.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.coords.Cell` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/coords/test_CellMeasure.py b/lib/iris/tests/unit/coords/test_CellMeasure.py
index 0bd66c6e98..c667e012ef 100644
--- a/lib/iris/tests/unit/coords/test_CellMeasure.py
+++ b/lib/iris/tests/unit/coords/test_CellMeasure.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.coords.CellMeasure` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/coords/test_CellMethod.py b/lib/iris/tests/unit/coords/test_CellMethod.py
index 21b309a32b..274606510a 100644
--- a/lib/iris/tests/unit/coords/test_CellMethod.py
+++ b/lib/iris/tests/unit/coords/test_CellMethod.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.coords.CellMethod`.
 """
diff --git a/lib/iris/tests/unit/coords/test_Coord.py b/lib/iris/tests/unit/coords/test_Coord.py
index c548d017f2..1c9c3cce2d 100644
--- a/lib/iris/tests/unit/coords/test_Coord.py
+++ b/lib/iris/tests/unit/coords/test_Coord.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.coords.Coord` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/coords/test_DimCoord.py b/lib/iris/tests/unit/coords/test_DimCoord.py
index dd0ba48f3d..2c8ab3a7ba 100644
--- a/lib/iris/tests/unit/coords/test_DimCoord.py
+++ b/lib/iris/tests/unit/coords/test_DimCoord.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.coords.DimCoord` class.
 
diff --git a/lib/iris/tests/unit/coords/test__DimensionalMetadata.py b/lib/iris/tests/unit/coords/test__DimensionalMetadata.py
index 83fcbc4512..91a50a9a1c 100644
--- a/lib/iris/tests/unit/coords/test__DimensionalMetadata.py
+++ b/lib/iris/tests/unit/coords/test__DimensionalMetadata.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.coords._DimensionalMetadata` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/cube/__init__.py b/lib/iris/tests/unit/cube/__init__.py
index 7852593e21..8c72b2af8c 100644
--- a/lib/iris/tests/unit/cube/__init__.py
+++ b/lib/iris/tests/unit/cube/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.cube` module."""
diff --git a/lib/iris/tests/unit/cube/test_Cube.py b/lib/iris/tests/unit/cube/test_Cube.py
index 443c9db546..b1eed4743e 100644
--- a/lib/iris/tests/unit/cube/test_Cube.py
+++ b/lib/iris/tests/unit/cube/test_Cube.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.cube.Cube` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/cube/test_CubeList.py b/lib/iris/tests/unit/cube/test_CubeList.py
index 86457d3888..386df39b66 100644
--- a/lib/iris/tests/unit/cube/test_CubeList.py
+++ b/lib/iris/tests/unit/cube/test_CubeList.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.cube.CubeList` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/cube/test_Cube__aggregated_by.py b/lib/iris/tests/unit/cube/test_Cube__aggregated_by.py
index c591e45f63..854a0d431a 100644
--- a/lib/iris/tests/unit/cube/test_Cube__aggregated_by.py
+++ b/lib/iris/tests/unit/cube/test_Cube__aggregated_by.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.cube.Cube` class aggregated_by method."""
 
 # import iris tests first so that some things can be initialised
diff --git a/lib/iris/tests/unit/cube/test_Cube__operators.py b/lib/iris/tests/unit/cube/test_Cube__operators.py
index e860c57636..0afd5a9d70 100644
--- a/lib/iris/tests/unit/cube/test_Cube__operators.py
+++ b/lib/iris/tests/unit/cube/test_Cube__operators.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.cube.Cube` class operators."""
 
 # import iris tests first so that some things can be initialised
diff --git a/lib/iris/tests/unit/data_manager/__init__.py b/lib/iris/tests/unit/data_manager/__init__.py
index 41dcc0adf3..1a2ebdc944 100644
--- a/lib/iris/tests/unit/data_manager/__init__.py
+++ b/lib/iris/tests/unit/data_manager/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris._data_manager` module."""
diff --git a/lib/iris/tests/unit/data_manager/test_DataManager.py b/lib/iris/tests/unit/data_manager/test_DataManager.py
index e73714730f..1b91e256f4 100644
--- a/lib/iris/tests/unit/data_manager/test_DataManager.py
+++ b/lib/iris/tests/unit/data_manager/test_DataManager.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris._data_manager.DataManager`.
 
diff --git a/lib/iris/tests/unit/experimental/__init__.py b/lib/iris/tests/unit/experimental/__init__.py
index 438827bab2..38af9c7a97 100644
--- a/lib/iris/tests/unit/experimental/__init__.py
+++ b/lib/iris/tests/unit/experimental/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.experimental` package."""
diff --git a/lib/iris/tests/unit/experimental/raster/__init__.py b/lib/iris/tests/unit/experimental/raster/__init__.py
index 5f85d810c9..408926e2d9 100644
--- a/lib/iris/tests/unit/experimental/raster/__init__.py
+++ b/lib/iris/tests/unit/experimental/raster/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.experimental.raster` module."""
diff --git a/lib/iris/tests/unit/experimental/raster/test_export_geotiff.py b/lib/iris/tests/unit/experimental/raster/test_export_geotiff.py
index a3b68ef761..af726c0fa9 100644
--- a/lib/iris/tests/unit/experimental/raster/test_export_geotiff.py
+++ b/lib/iris/tests/unit/experimental/raster/test_export_geotiff.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.experimental.raster.export_geotiff` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/experimental/regrid/__init__.py b/lib/iris/tests/unit/experimental/regrid/__init__.py
index 578c15f11c..f001cccada 100644
--- a/lib/iris/tests/unit/experimental/regrid/__init__.py
+++ b/lib/iris/tests/unit/experimental/regrid/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.experimental.regrid` package."""
diff --git a/lib/iris/tests/unit/experimental/regrid/test_regrid_area_weighted_rectilinear_src_and_grid.py b/lib/iris/tests/unit/experimental/regrid/test_regrid_area_weighted_rectilinear_src_and_grid.py
index 5ec3c956b9..3cec1f8569 100644
--- a/lib/iris/tests/unit/experimental/regrid/test_regrid_area_weighted_rectilinear_src_and_grid.py
+++ b/lib/iris/tests/unit/experimental/regrid/test_regrid_area_weighted_rectilinear_src_and_grid.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function
 :func:`iris.experimental.regrid.regrid_area_weighted_rectilinear_src_and_grid`.
diff --git a/lib/iris/tests/unit/experimental/regrid/test_regrid_weighted_curvilinear_to_rectilinear.py b/lib/iris/tests/unit/experimental/regrid/test_regrid_weighted_curvilinear_to_rectilinear.py
index b0908dd2e4..f9397da219 100644
--- a/lib/iris/tests/unit/experimental/regrid/test_regrid_weighted_curvilinear_to_rectilinear.py
+++ b/lib/iris/tests/unit/experimental/regrid/test_regrid_weighted_curvilinear_to_rectilinear.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function
 :func:`iris.experimental.regrid.regrid_weighted_curvilinear_to_rectilinear`.
diff --git a/lib/iris/tests/unit/experimental/representation/__init__.py b/lib/iris/tests/unit/experimental/representation/__init__.py
index c856263a5c..764b46ef58 100644
--- a/lib/iris/tests/unit/experimental/representation/__init__.py
+++ b/lib/iris/tests/unit/experimental/representation/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.experimental.representation` package."""
diff --git a/lib/iris/tests/unit/experimental/representation/test_CubeListRepresentation.py b/lib/iris/tests/unit/experimental/representation/test_CubeListRepresentation.py
index 8dc3cd7849..678eaa5fea 100644
--- a/lib/iris/tests/unit/experimental/representation/test_CubeListRepresentation.py
+++ b/lib/iris/tests/unit/experimental/representation/test_CubeListRepresentation.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.cube.CubeRepresentation` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/experimental/representation/test_CubeRepresentation.py b/lib/iris/tests/unit/experimental/representation/test_CubeRepresentation.py
index e6b1425110..aadb07c882 100644
--- a/lib/iris/tests/unit/experimental/representation/test_CubeRepresentation.py
+++ b/lib/iris/tests/unit/experimental/representation/test_CubeRepresentation.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.cube.CubeRepresentation` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/experimental/stratify/__init__.py b/lib/iris/tests/unit/experimental/stratify/__init__.py
index 7218455e76..41663ee7a4 100644
--- a/lib/iris/tests/unit/experimental/stratify/__init__.py
+++ b/lib/iris/tests/unit/experimental/stratify/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.experimental.stratify` package."""
diff --git a/lib/iris/tests/unit/experimental/stratify/test_relevel.py b/lib/iris/tests/unit/experimental/stratify/test_relevel.py
index 6958fa9a2f..a0db398257 100644
--- a/lib/iris/tests/unit/experimental/stratify/test_relevel.py
+++ b/lib/iris/tests/unit/experimental/stratify/test_relevel.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :func:`iris.experimental.stratify.relevel` function.
 
diff --git a/lib/iris/tests/unit/experimental/ugrid/__init__.py b/lib/iris/tests/unit/experimental/ugrid/__init__.py
index 7f55678f06..27d7921e5f 100644
--- a/lib/iris/tests/unit/experimental/ugrid/__init__.py
+++ b/lib/iris/tests/unit/experimental/ugrid/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.experimental.ugrid` package."""
diff --git a/lib/iris/tests/unit/experimental/ugrid/cf/__init__.py b/lib/iris/tests/unit/experimental/ugrid/cf/__init__.py
index 2e70f2cd5d..19507555c7 100644
--- a/lib/iris/tests/unit/experimental/ugrid/cf/__init__.py
+++ b/lib/iris/tests/unit/experimental/ugrid/cf/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.experimental.ugrid.cf` package."""
diff --git a/lib/iris/tests/unit/experimental/ugrid/cf/test_CFUGridAuxiliaryCoordinateVariable.py b/lib/iris/tests/unit/experimental/ugrid/cf/test_CFUGridAuxiliaryCoordinateVariable.py
index 641b6b7b44..22914215b7 100644
--- a/lib/iris/tests/unit/experimental/ugrid/cf/test_CFUGridAuxiliaryCoordinateVariable.py
+++ b/lib/iris/tests/unit/experimental/ugrid/cf/test_CFUGridAuxiliaryCoordinateVariable.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.experimental.ugrid.cf.CFUGridAuxiliaryCoordinateVariable` class.
 
diff --git a/lib/iris/tests/unit/experimental/ugrid/cf/test_CFUGridConnectivityVariable.py b/lib/iris/tests/unit/experimental/ugrid/cf/test_CFUGridConnectivityVariable.py
index 5a68a8c03f..5fae20e6fc 100644
--- a/lib/iris/tests/unit/experimental/ugrid/cf/test_CFUGridConnectivityVariable.py
+++ b/lib/iris/tests/unit/experimental/ugrid/cf/test_CFUGridConnectivityVariable.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.experimental.ugrid.cf.CFUGridConnectivityVariable` class.
 
diff --git a/lib/iris/tests/unit/experimental/ugrid/cf/test_CFUGridGroup.py b/lib/iris/tests/unit/experimental/ugrid/cf/test_CFUGridGroup.py
index a3a0e665bb..1e707d9550 100644
--- a/lib/iris/tests/unit/experimental/ugrid/cf/test_CFUGridGroup.py
+++ b/lib/iris/tests/unit/experimental/ugrid/cf/test_CFUGridGroup.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.experimental.ugrid.cf.CFUGridGroup` class.
 
diff --git a/lib/iris/tests/unit/experimental/ugrid/cf/test_CFUGridMeshVariable.py b/lib/iris/tests/unit/experimental/ugrid/cf/test_CFUGridMeshVariable.py
index 8302c30177..59d3a8aad9 100644
--- a/lib/iris/tests/unit/experimental/ugrid/cf/test_CFUGridMeshVariable.py
+++ b/lib/iris/tests/unit/experimental/ugrid/cf/test_CFUGridMeshVariable.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.experimental.ugrid.cf.CFUGridMeshVariable` class.
 
diff --git a/lib/iris/tests/unit/experimental/ugrid/cf/test_CFUGridReader.py b/lib/iris/tests/unit/experimental/ugrid/cf/test_CFUGridReader.py
index d9de814b05..52eb569b43 100644
--- a/lib/iris/tests/unit/experimental/ugrid/cf/test_CFUGridReader.py
+++ b/lib/iris/tests/unit/experimental/ugrid/cf/test_CFUGridReader.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.experimental.ugrid.cf.CFUGridGroup` class.
 
diff --git a/lib/iris/tests/unit/experimental/ugrid/load/__init__.py b/lib/iris/tests/unit/experimental/ugrid/load/__init__.py
index 36c9108dc2..3248db6e41 100644
--- a/lib/iris/tests/unit/experimental/ugrid/load/__init__.py
+++ b/lib/iris/tests/unit/experimental/ugrid/load/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.experimental.ugrid.load` package."""
diff --git a/lib/iris/tests/unit/experimental/ugrid/load/test_ParseUgridOnLoad.py b/lib/iris/tests/unit/experimental/ugrid/load/test_ParseUgridOnLoad.py
index 1203633297..5c33b27d3e 100644
--- a/lib/iris/tests/unit/experimental/ugrid/load/test_ParseUgridOnLoad.py
+++ b/lib/iris/tests/unit/experimental/ugrid/load/test_ParseUgridOnLoad.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.experimental.ugrid.load.ParseUgridOnLoad` class.
 
diff --git a/lib/iris/tests/unit/experimental/ugrid/load/test_load_mesh.py b/lib/iris/tests/unit/experimental/ugrid/load/test_load_mesh.py
index 4de11d5610..8dab48ae9c 100644
--- a/lib/iris/tests/unit/experimental/ugrid/load/test_load_mesh.py
+++ b/lib/iris/tests/unit/experimental/ugrid/load/test_load_mesh.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :func:`iris.experimental.ugrid.load.load_mesh` function.
 
diff --git a/lib/iris/tests/unit/experimental/ugrid/load/test_load_meshes.py b/lib/iris/tests/unit/experimental/ugrid/load/test_load_meshes.py
index 310e68248a..1ec3e65a97 100644
--- a/lib/iris/tests/unit/experimental/ugrid/load/test_load_meshes.py
+++ b/lib/iris/tests/unit/experimental/ugrid/load/test_load_meshes.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :func:`iris.experimental.ugrid.load.load_meshes` function.
 
diff --git a/lib/iris/tests/unit/experimental/ugrid/mesh/__init__.py b/lib/iris/tests/unit/experimental/ugrid/mesh/__init__.py
index 4ce979d845..d485782c11 100644
--- a/lib/iris/tests/unit/experimental/ugrid/mesh/__init__.py
+++ b/lib/iris/tests/unit/experimental/ugrid/mesh/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.experimental.ugrid.mesh` package."""
diff --git a/lib/iris/tests/unit/experimental/ugrid/mesh/test_Connectivity.py b/lib/iris/tests/unit/experimental/ugrid/mesh/test_Connectivity.py
index 7e90555801..7251597006 100644
--- a/lib/iris/tests/unit/experimental/ugrid/mesh/test_Connectivity.py
+++ b/lib/iris/tests/unit/experimental/ugrid/mesh/test_Connectivity.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.experimental.ugrid.mesh.Connectivity` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/experimental/ugrid/mesh/test_Mesh.py b/lib/iris/tests/unit/experimental/ugrid/mesh/test_Mesh.py
index 64d106f97d..6784bb6e50 100644
--- a/lib/iris/tests/unit/experimental/ugrid/mesh/test_Mesh.py
+++ b/lib/iris/tests/unit/experimental/ugrid/mesh/test_Mesh.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`mesh` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/experimental/ugrid/mesh/test_MeshCoord.py b/lib/iris/tests/unit/experimental/ugrid/mesh/test_MeshCoord.py
index b95c5f09bb..a023762d10 100644
--- a/lib/iris/tests/unit/experimental/ugrid/mesh/test_MeshCoord.py
+++ b/lib/iris/tests/unit/experimental/ugrid/mesh/test_MeshCoord.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.experimental.ugrid.mesh.MeshCoord`.
 
diff --git a/lib/iris/tests/unit/experimental/ugrid/mesh/test_Mesh__from_coords.py b/lib/iris/tests/unit/experimental/ugrid/mesh/test_Mesh__from_coords.py
index edd34f94a1..2581bf106a 100644
--- a/lib/iris/tests/unit/experimental/ugrid/mesh/test_Mesh__from_coords.py
+++ b/lib/iris/tests/unit/experimental/ugrid/mesh/test_Mesh__from_coords.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :meth:`iris.experimental.ugrid.mesh.Mesh.from_coords`.
 
diff --git a/lib/iris/tests/unit/experimental/ugrid/metadata/__init__.py b/lib/iris/tests/unit/experimental/ugrid/metadata/__init__.py
index 2d2d040c1d..a8ad2bc014 100644
--- a/lib/iris/tests/unit/experimental/ugrid/metadata/__init__.py
+++ b/lib/iris/tests/unit/experimental/ugrid/metadata/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.experimental.ugrid.metadata` package."""
diff --git a/lib/iris/tests/unit/experimental/ugrid/metadata/test_ConnectivityMetadata.py b/lib/iris/tests/unit/experimental/ugrid/metadata/test_ConnectivityMetadata.py
index af92e69b08..3b8e5ded9f 100644
--- a/lib/iris/tests/unit/experimental/ugrid/metadata/test_ConnectivityMetadata.py
+++ b/lib/iris/tests/unit/experimental/ugrid/metadata/test_ConnectivityMetadata.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.experimental.ugrid.metadata.ConnectivityMetadata`.
 
diff --git a/lib/iris/tests/unit/experimental/ugrid/metadata/test_MeshCoordMetadata.py b/lib/iris/tests/unit/experimental/ugrid/metadata/test_MeshCoordMetadata.py
index 5c96fb7856..0786c52934 100644
--- a/lib/iris/tests/unit/experimental/ugrid/metadata/test_MeshCoordMetadata.py
+++ b/lib/iris/tests/unit/experimental/ugrid/metadata/test_MeshCoordMetadata.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.experimental.ugrid.metadata.MeshCoordMetadata`.
 
diff --git a/lib/iris/tests/unit/experimental/ugrid/metadata/test_MeshMetadata.py b/lib/iris/tests/unit/experimental/ugrid/metadata/test_MeshMetadata.py
index a8b25dc2e7..ba7199b777 100644
--- a/lib/iris/tests/unit/experimental/ugrid/metadata/test_MeshMetadata.py
+++ b/lib/iris/tests/unit/experimental/ugrid/metadata/test_MeshMetadata.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.experimental.ugrid.metadata.MeshMetadata`.
 
diff --git a/lib/iris/tests/unit/experimental/ugrid/utils/__init__.py b/lib/iris/tests/unit/experimental/ugrid/utils/__init__.py
index 135d7ee49c..ea8202f8fb 100644
--- a/lib/iris/tests/unit/experimental/ugrid/utils/__init__.py
+++ b/lib/iris/tests/unit/experimental/ugrid/utils/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.experimental.ugrid.utils` package."""
diff --git a/lib/iris/tests/unit/experimental/ugrid/utils/test_recombine_submeshes.py b/lib/iris/tests/unit/experimental/ugrid/utils/test_recombine_submeshes.py
index 4face700ad..a3cd91815f 100644
--- a/lib/iris/tests/unit/experimental/ugrid/utils/test_recombine_submeshes.py
+++ b/lib/iris/tests/unit/experimental/ugrid/utils/test_recombine_submeshes.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for :func:`iris.experimental.ugrid.utils.recombine_submeshes`.
 
diff --git a/lib/iris/tests/unit/fileformats/__init__.py b/lib/iris/tests/unit/fileformats/__init__.py
index fa31283c87..4c0bca25c1 100644
--- a/lib/iris/tests/unit/fileformats/__init__.py
+++ b/lib/iris/tests/unit/fileformats/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.fileformats` package."""
 
 import iris.tests as tests  # isort:skip
diff --git a/lib/iris/tests/unit/fileformats/abf/__init__.py b/lib/iris/tests/unit/fileformats/abf/__init__.py
index aaddf427c5..5ddf017c42 100644
--- a/lib/iris/tests/unit/fileformats/abf/__init__.py
+++ b/lib/iris/tests/unit/fileformats/abf/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.fileformats.abf` module."""
diff --git a/lib/iris/tests/unit/fileformats/abf/test_ABFField.py b/lib/iris/tests/unit/fileformats/abf/test_ABFField.py
index 98db52d3e9..b67e02ec06 100644
--- a/lib/iris/tests/unit/fileformats/abf/test_ABFField.py
+++ b/lib/iris/tests/unit/fileformats/abf/test_ABFField.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.fileformats.abf.ABFField` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/cf/__init__.py b/lib/iris/tests/unit/fileformats/cf/__init__.py
index 1bff79368b..6bc562f922 100644
--- a/lib/iris/tests/unit/fileformats/cf/__init__.py
+++ b/lib/iris/tests/unit/fileformats/cf/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.fileformats.cf` module."""
diff --git a/lib/iris/tests/unit/fileformats/cf/test_CFGroup.py b/lib/iris/tests/unit/fileformats/cf/test_CFGroup.py
index bfc2d586ef..48f383d7f7 100644
--- a/lib/iris/tests/unit/fileformats/cf/test_CFGroup.py
+++ b/lib/iris/tests/unit/fileformats/cf/test_CFGroup.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.fileformats.cf.CFGroup` class."""
 
 from unittest.mock import MagicMock
diff --git a/lib/iris/tests/unit/fileformats/cf/test_CFReader.py b/lib/iris/tests/unit/fileformats/cf/test_CFReader.py
index 9e5cf9b7a5..4829d03dbb 100644
--- a/lib/iris/tests/unit/fileformats/cf/test_CFReader.py
+++ b/lib/iris/tests/unit/fileformats/cf/test_CFReader.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the `iris.fileformats.cf.CFReader` class.
 
diff --git a/lib/iris/tests/unit/fileformats/dot/__init__.py b/lib/iris/tests/unit/fileformats/dot/__init__.py
index 0dbc3ad4c6..afbfed17d8 100644
--- a/lib/iris/tests/unit/fileformats/dot/__init__.py
+++ b/lib/iris/tests/unit/fileformats/dot/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :mod:`iris.fileformats.dot`."""
diff --git a/lib/iris/tests/unit/fileformats/dot/test__dot_path.py b/lib/iris/tests/unit/fileformats/dot/test__dot_path.py
index 1111e8bc83..a29eb625d0 100644
--- a/lib/iris/tests/unit/fileformats/dot/test__dot_path.py
+++ b/lib/iris/tests/unit/fileformats/dot/test__dot_path.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :func:`iris.fileformats.dot._dot_path`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/ff/__init__.py b/lib/iris/tests/unit/fileformats/ff/__init__.py
index 4d13a18520..945b4f46b5 100644
--- a/lib/iris/tests/unit/fileformats/ff/__init__.py
+++ b/lib/iris/tests/unit/fileformats/ff/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.fileformats.ff` module."""
diff --git a/lib/iris/tests/unit/fileformats/ff/test_ArakawaC.py b/lib/iris/tests/unit/fileformats/ff/test_ArakawaC.py
index d37b854405..5e731632c6 100644
--- a/lib/iris/tests/unit/fileformats/ff/test_ArakawaC.py
+++ b/lib/iris/tests/unit/fileformats/ff/test_ArakawaC.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :class:`iris.fileformat.ff.ArakawaC`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/ff/test_ENDGame.py b/lib/iris/tests/unit/fileformats/ff/test_ENDGame.py
index 696dacd672..98bc42ddf3 100644
--- a/lib/iris/tests/unit/fileformats/ff/test_ENDGame.py
+++ b/lib/iris/tests/unit/fileformats/ff/test_ENDGame.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :class:`iris.fileformat.ff.ENDGame`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/ff/test_FF2PP.py b/lib/iris/tests/unit/fileformats/ff/test_FF2PP.py
index 16943c0c15..15bb61e230 100644
--- a/lib/iris/tests/unit/fileformats/ff/test_FF2PP.py
+++ b/lib/iris/tests/unit/fileformats/ff/test_FF2PP.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.fileformat.ff.FF2PP` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/ff/test_FFHeader.py b/lib/iris/tests/unit/fileformats/ff/test_FFHeader.py
index 72d522ec85..cbbc81dd4b 100644
--- a/lib/iris/tests/unit/fileformats/ff/test_FFHeader.py
+++ b/lib/iris/tests/unit/fileformats/ff/test_FFHeader.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :class:`iris.fileformat.ff.FFHeader`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/ff/test_Grid.py b/lib/iris/tests/unit/fileformats/ff/test_Grid.py
index b20c85b9a8..1bb9688c1a 100644
--- a/lib/iris/tests/unit/fileformats/ff/test_Grid.py
+++ b/lib/iris/tests/unit/fileformats/ff/test_Grid.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :class:`iris.fileformat.ff.Grid`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/ff/test_NewDynamics.py b/lib/iris/tests/unit/fileformats/ff/test_NewDynamics.py
index 5f0d64da71..f3cc41aa82 100644
--- a/lib/iris/tests/unit/fileformats/ff/test_NewDynamics.py
+++ b/lib/iris/tests/unit/fileformats/ff/test_NewDynamics.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :class:`iris.fileformat.ff.NewDynamics`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/name_loaders/__init__.py b/lib/iris/tests/unit/fileformats/name_loaders/__init__.py
index 751801a176..e9af5168b8 100644
--- a/lib/iris/tests/unit/fileformats/name_loaders/__init__.py
+++ b/lib/iris/tests/unit/fileformats/name_loaders/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.fileformats.name_loaders` package."""
diff --git a/lib/iris/tests/unit/fileformats/name_loaders/test__build_cell_methods.py b/lib/iris/tests/unit/fileformats/name_loaders/test__build_cell_methods.py
index 624837c19d..2ebde5782f 100644
--- a/lib/iris/tests/unit/fileformats/name_loaders/test__build_cell_methods.py
+++ b/lib/iris/tests/unit/fileformats/name_loaders/test__build_cell_methods.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for :func:`iris.fileformats.name_loaders._build_cell_methods`.
 
diff --git a/lib/iris/tests/unit/fileformats/name_loaders/test__build_lat_lon_for_NAME_timeseries.py b/lib/iris/tests/unit/fileformats/name_loaders/test__build_lat_lon_for_NAME_timeseries.py
index 5954823c54..e71a31f10f 100644
--- a/lib/iris/tests/unit/fileformats/name_loaders/test__build_lat_lon_for_NAME_timeseries.py
+++ b/lib/iris/tests/unit/fileformats/name_loaders/test__build_lat_lon_for_NAME_timeseries.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for :func:`iris.analysis.name_loaders._build_lat_lon_for_NAME_timeseries`.
 
diff --git a/lib/iris/tests/unit/fileformats/name_loaders/test__calc_integration_period.py b/lib/iris/tests/unit/fileformats/name_loaders/test__calc_integration_period.py
index c4cbde8c14..20ef79cec3 100644
--- a/lib/iris/tests/unit/fileformats/name_loaders/test__calc_integration_period.py
+++ b/lib/iris/tests/unit/fileformats/name_loaders/test__calc_integration_period.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for :func:`iris.fileformats.name_loaders.__calc_integration_period`.
 
diff --git a/lib/iris/tests/unit/fileformats/name_loaders/test__cf_height_from_name.py b/lib/iris/tests/unit/fileformats/name_loaders/test__cf_height_from_name.py
index 078f65d572..ea09d40acb 100644
--- a/lib/iris/tests/unit/fileformats/name_loaders/test__cf_height_from_name.py
+++ b/lib/iris/tests/unit/fileformats/name_loaders/test__cf_height_from_name.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.analysis.name_loaders._cf_height_from_name`
 function.
diff --git a/lib/iris/tests/unit/fileformats/name_loaders/test__generate_cubes.py b/lib/iris/tests/unit/fileformats/name_loaders/test__generate_cubes.py
index d50a7fdad1..2eea25a26d 100644
--- a/lib/iris/tests/unit/fileformats/name_loaders/test__generate_cubes.py
+++ b/lib/iris/tests/unit/fileformats/name_loaders/test__generate_cubes.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for :func:`iris.analysis.name_loaders._generate_cubes`.
 
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/__init__.py b/lib/iris/tests/unit/fileformats/nc_load_rules/__init__.py
index 2ea22c420b..a29f504b7e 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/__init__.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the module
 :mod:`iris.fileformats.netcdf._nc_load_rules` .
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/actions/__init__.py b/lib/iris/tests/unit/fileformats/nc_load_rules/actions/__init__.py
index 38882810d2..efb5e55be8 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/actions/__init__.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/actions/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the module :mod:`iris.fileformats._nc_load_rules.actions`.
 
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/actions/test__grid_mappings.py b/lib/iris/tests/unit/fileformats/nc_load_rules/actions/test__grid_mappings.py
index 99a1b66ae4..906ba33f9c 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/actions/test__grid_mappings.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/actions/test__grid_mappings.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the engine.activate() call within the
 `iris.fileformats.netcdf._load_cube` function.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/actions/test__hybrid_formulae.py b/lib/iris/tests/unit/fileformats/nc_load_rules/actions/test__hybrid_formulae.py
index d962fc2758..582ab7e200 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/actions/test__hybrid_formulae.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/actions/test__hybrid_formulae.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the engine.activate() call within the
 `iris.fileformats.netcdf._load_cube` function.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/actions/test__latlon_dimcoords.py b/lib/iris/tests/unit/fileformats/nc_load_rules/actions/test__latlon_dimcoords.py
index dfa862c4d1..a8c7d2cc5f 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/actions/test__latlon_dimcoords.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/actions/test__latlon_dimcoords.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the engine.activate() call within the
 `iris.fileformats.netcdf._load_cube` function.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/actions/test__miscellaneous.py b/lib/iris/tests/unit/fileformats/nc_load_rules/actions/test__miscellaneous.py
index ffe00c8c19..a1a93056cb 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/actions/test__miscellaneous.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/actions/test__miscellaneous.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the engine.activate() call within the
 `iris.fileformats.netcdf._load_cube` function.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/actions/test__time_coords.py b/lib/iris/tests/unit/fileformats/nc_load_rules/actions/test__time_coords.py
index 59ffa30684..c27d2445e9 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/actions/test__time_coords.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/actions/test__time_coords.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the engine.activate() call within the
 `iris.fileformats.netcdf._load_cube` function.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/engine/__init__.py b/lib/iris/tests/unit/fileformats/nc_load_rules/engine/__init__.py
index e6508bea85..127ebbf68b 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/engine/__init__.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/engine/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the module
 :mod:`iris.fileformats.netcdf._nc_load_rules.engine` .
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/engine/test_engine.py b/lib/iris/tests/unit/fileformats/nc_load_rules/engine/test_engine.py
index df5fbd4922..994d2958c2 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/engine/test_engine.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/engine/test_engine.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :mod:`iris.fileformats._nc_load_rules.engine` module.
 
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/__init__.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/__init__.py
index 69a536b9ae..62bc3a6c9f 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/__init__.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the module
 :mod:`iris.fileformats.netcdf._nc_load_rules.helpers` .
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_albers_equal_area_coordinate_system.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_albers_equal_area_coordinate_system.py
index c040d43ca0..b6e9ba954c 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_albers_equal_area_coordinate_system.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_albers_equal_area_coordinate_system.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers.\
 build_albers_equal_area_coordinate_system`.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_ancil_var.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_ancil_var.py
index 87070e00ba..2d1010166f 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_ancil_var.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_ancil_var.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers.build_ancil_var`.
 
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_auxiliary_coordinate.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_auxiliary_coordinate.py
index 369f92f238..fd500b4831 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_auxiliary_coordinate.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_auxiliary_coordinate.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers.\
 build_auxilliary_coordinate`.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_cell_measure.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_cell_measure.py
index d0421186b4..ee66f8b267 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_cell_measure.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_cell_measure.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers.build_cell_measure`.
 
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_cube_metadata.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_cube_metadata.py
index a13fa6cca0..e2297be69e 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_cube_metadata.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_cube_metadata.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers\
 build_cube_metadata`.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_dimension_coordinate.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_dimension_coordinate.py
index bc13975441..4f19d44a2a 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_dimension_coordinate.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_dimension_coordinate.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers.\
 build_dimension_coordinate`.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_geostationary_coordinate_system.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_geostationary_coordinate_system.py
index 28b3d8ab9a..a3efcb0dc4 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_geostationary_coordinate_system.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_geostationary_coordinate_system.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers.\
 build_geostationary_coordinate_system`.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_lambert_azimuthal_equal_area_coordinate_system.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_lambert_azimuthal_equal_area_coordinate_system.py
index 05185a4cf5..8d5b46c6bb 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_lambert_azimuthal_equal_area_coordinate_system.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_lambert_azimuthal_equal_area_coordinate_system.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers.\
 build_lambert_azimuthal_equal_area_coordinate_system`.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_lambert_conformal_coordinate_system.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_lambert_conformal_coordinate_system.py
index 22bb7149b1..9232e146cb 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_lambert_conformal_coordinate_system.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_lambert_conformal_coordinate_system.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers.\
 build_lambert_conformal_coordinate_system`.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_mercator_coordinate_system.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_mercator_coordinate_system.py
index ab61d3b1b2..4958eccbfd 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_mercator_coordinate_system.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_mercator_coordinate_system.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers.\
 build_mercator_coordinate_system`.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_oblique_mercator_coordinate_system.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_oblique_mercator_coordinate_system.py
index b11d8d3cca..c377cf7d1b 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_oblique_mercator_coordinate_system.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_oblique_mercator_coordinate_system.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers.build_oblique_mercator_coordinate_system`.
 
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_polar_stereographic_coordinate_system.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_polar_stereographic_coordinate_system.py
index 09cfde9d5b..a20443005c 100755
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_polar_stereographic_coordinate_system.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_polar_stereographic_coordinate_system.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers.\
 build_polar_stereographic_coordinate_system`.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_stereographic_coordinate_system.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_stereographic_coordinate_system.py
index 3796aeebab..a483390e36 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_stereographic_coordinate_system.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_stereographic_coordinate_system.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers.\
 build_sterographic_coordinate_system`.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_transverse_mercator_coordinate_system.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_transverse_mercator_coordinate_system.py
index 0096c5df4b..ae881259fe 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_transverse_mercator_coordinate_system.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_transverse_mercator_coordinate_system.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers.\
 build_transverse_mercator_coordinate_system`.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_verticalp_coordinate_system.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_verticalp_coordinate_system.py
index f34992c2be..21906ba644 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_verticalp_coordinate_system.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_build_verticalp_coordinate_system.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers.\
 build_vertical_perspective_coordinate_system`.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_get_attr_units.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_get_attr_units.py
index a159ef81a8..d80b33f002 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_get_attr_units.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_get_attr_units.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers.\
 get_attr_units`.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_get_cf_bounds_var.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_get_cf_bounds_var.py
index ff9c51f40b..7d0dc4952c 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_get_cf_bounds_var.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_get_cf_bounds_var.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers.\
 get_cf_bounds_var`.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_get_names.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_get_names.py
index 3c7c496b54..b6a0f3d3c1 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_get_names.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_get_names.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers.\
 get_names`.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_has_supported_mercator_parameters.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_has_supported_mercator_parameters.py
index bb94adc72e..9dc31ba490 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_has_supported_mercator_parameters.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_has_supported_mercator_parameters.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers.\
 has_supported_mercator_parameters`.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_has_supported_polar_stereographic_parameters.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_has_supported_polar_stereographic_parameters.py
index 6e6d6e4e81..faffefd8f2 100755
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_has_supported_polar_stereographic_parameters.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_has_supported_polar_stereographic_parameters.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers.\
 has_supported_polar_stereographic_parameters`.
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_parse_cell_methods.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_parse_cell_methods.py
index 9935a6e5ae..a58413d399 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_parse_cell_methods.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_parse_cell_methods.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for :func:`iris.fileformats.netcdf.parse_cell_methods`.
 
diff --git a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_reorder_bounds_data.py b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_reorder_bounds_data.py
index 1ee0cfbf2e..1e9d13110e 100644
--- a/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_reorder_bounds_data.py
+++ b/lib/iris/tests/unit/fileformats/nc_load_rules/helpers/test_reorder_bounds_data.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.fileformats._nc_load_rules.helpers.\
 reorder_bounds_data`.
diff --git a/lib/iris/tests/unit/fileformats/netcdf/__init__.py b/lib/iris/tests/unit/fileformats/netcdf/__init__.py
index 732094f67a..961f7779a8 100644
--- a/lib/iris/tests/unit/fileformats/netcdf/__init__.py
+++ b/lib/iris/tests/unit/fileformats/netcdf/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.fileformats.netcdf` module."""
diff --git a/lib/iris/tests/unit/fileformats/netcdf/loader/__init__.py b/lib/iris/tests/unit/fileformats/netcdf/loader/__init__.py
index 7c2ae96158..67d3fe0fc6 100644
--- a/lib/iris/tests/unit/fileformats/netcdf/loader/__init__.py
+++ b/lib/iris/tests/unit/fileformats/netcdf/loader/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.fileformats.netcdf.loader` module."""
diff --git a/lib/iris/tests/unit/fileformats/netcdf/loader/test__get_cf_var_data.py b/lib/iris/tests/unit/fileformats/netcdf/loader/test__get_cf_var_data.py
index 6c487d74e7..3c3cbff7f4 100644
--- a/lib/iris/tests/unit/fileformats/netcdf/loader/test__get_cf_var_data.py
+++ b/lib/iris/tests/unit/fileformats/netcdf/loader/test__get_cf_var_data.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.fileformats.netcdf._get_cf_var_data` function."""
 # Import iris.tests first so that some things can be initialised before
 # importing anything else.
diff --git a/lib/iris/tests/unit/fileformats/netcdf/loader/test__load_aux_factory.py b/lib/iris/tests/unit/fileformats/netcdf/loader/test__load_aux_factory.py
index c15c8737fd..01c6838241 100644
--- a/lib/iris/tests/unit/fileformats/netcdf/loader/test__load_aux_factory.py
+++ b/lib/iris/tests/unit/fileformats/netcdf/loader/test__load_aux_factory.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.fileformats.netcdf._load_aux_factory` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/netcdf/loader/test__load_cube.py b/lib/iris/tests/unit/fileformats/netcdf/loader/test__load_cube.py
index b67c546aa0..25beca8f59 100644
--- a/lib/iris/tests/unit/fileformats/netcdf/loader/test__load_cube.py
+++ b/lib/iris/tests/unit/fileformats/netcdf/loader/test__load_cube.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.fileformats.netcdf._load_cube` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/netcdf/loader/test__translate_constraints_to_var_callback.py b/lib/iris/tests/unit/fileformats/netcdf/loader/test__translate_constraints_to_var_callback.py
index 77bb0d3950..2522392c21 100644
--- a/lib/iris/tests/unit/fileformats/netcdf/loader/test__translate_constraints_to_var_callback.py
+++ b/lib/iris/tests/unit/fileformats/netcdf/loader/test__translate_constraints_to_var_callback.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for
 :func:`iris.fileformats.netcdf._translate_constraints_to_var_callback`.
diff --git a/lib/iris/tests/unit/fileformats/netcdf/loader/test_load_cubes.py b/lib/iris/tests/unit/fileformats/netcdf/loader/test_load_cubes.py
index 1a2ef1d29d..77c1da2d1c 100644
--- a/lib/iris/tests/unit/fileformats/netcdf/loader/test_load_cubes.py
+++ b/lib/iris/tests/unit/fileformats/netcdf/loader/test_load_cubes.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :func:`iris.fileformats.netcdf.load_cubes` function.
 
diff --git a/lib/iris/tests/unit/fileformats/netcdf/saver/__init__.py b/lib/iris/tests/unit/fileformats/netcdf/saver/__init__.py
index a68d5fc5d0..53d42128f6 100644
--- a/lib/iris/tests/unit/fileformats/netcdf/saver/__init__.py
+++ b/lib/iris/tests/unit/fileformats/netcdf/saver/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.fileformats.netcdf.saver` module."""
diff --git a/lib/iris/tests/unit/fileformats/netcdf/saver/test_Saver.py b/lib/iris/tests/unit/fileformats/netcdf/saver/test_Saver.py
index 8253e59368..e4d8488a76 100644
--- a/lib/iris/tests/unit/fileformats/netcdf/saver/test_Saver.py
+++ b/lib/iris/tests/unit/fileformats/netcdf/saver/test_Saver.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :class:`iris.fileformats.netcdf.Saver` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/netcdf/saver/test_Saver__lazy.py b/lib/iris/tests/unit/fileformats/netcdf/saver/test_Saver__lazy.py
index e1211dc276..2e7091c43b 100644
--- a/lib/iris/tests/unit/fileformats/netcdf/saver/test_Saver__lazy.py
+++ b/lib/iris/tests/unit/fileformats/netcdf/saver/test_Saver__lazy.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Mirror of :mod:`iris.tests.unit.fileformats.netcdf.test_Saver`, but with lazy arrays."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/netcdf/saver/test_Saver__lazy_stream_data.py b/lib/iris/tests/unit/fileformats/netcdf/saver/test_Saver__lazy_stream_data.py
index da5f2d88fa..10c5dbecf4 100644
--- a/lib/iris/tests/unit/fileformats/netcdf/saver/test_Saver__lazy_stream_data.py
+++ b/lib/iris/tests/unit/fileformats/netcdf/saver/test_Saver__lazy_stream_data.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for :meth:`iris.fileformats.netcdf.saver.Saver._lazy_stream_data`.
 
diff --git a/lib/iris/tests/unit/fileformats/netcdf/saver/test_Saver__ugrid.py b/lib/iris/tests/unit/fileformats/netcdf/saver/test_Saver__ugrid.py
index 27d9709fe6..8177e0c299 100644
--- a/lib/iris/tests/unit/fileformats/netcdf/saver/test_Saver__ugrid.py
+++ b/lib/iris/tests/unit/fileformats/netcdf/saver/test_Saver__ugrid.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :class:`iris.fileformats.netcdf.Saver` class.
 
diff --git a/lib/iris/tests/unit/fileformats/netcdf/saver/test__data_fillvalue_check.py b/lib/iris/tests/unit/fileformats/netcdf/saver/test__data_fillvalue_check.py
index 95a518e4e5..9068837b2c 100644
--- a/lib/iris/tests/unit/fileformats/netcdf/saver/test__data_fillvalue_check.py
+++ b/lib/iris/tests/unit/fileformats/netcdf/saver/test__data_fillvalue_check.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for :func:`iris.fileformats.netcdf.saver._data_fillvalue_check`.
 
diff --git a/lib/iris/tests/unit/fileformats/netcdf/saver/test__fillvalue_report.py b/lib/iris/tests/unit/fileformats/netcdf/saver/test__fillvalue_report.py
index 317f75bb8c..42119094a7 100644
--- a/lib/iris/tests/unit/fileformats/netcdf/saver/test__fillvalue_report.py
+++ b/lib/iris/tests/unit/fileformats/netcdf/saver/test__fillvalue_report.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for :func:`iris.fileformats.netcdf.saver._fillvalue_report`.
 """
diff --git a/lib/iris/tests/unit/fileformats/netcdf/saver/test_save.py b/lib/iris/tests/unit/fileformats/netcdf/saver/test_save.py
index 68049b57fc..620bc64461 100644
--- a/lib/iris/tests/unit/fileformats/netcdf/saver/test_save.py
+++ b/lib/iris/tests/unit/fileformats/netcdf/saver/test_save.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :func:`iris.fileformats.netcdf.save` function."""
 # Import iris.tests first so that some things can be initialised before
 # importing anything else.
diff --git a/lib/iris/tests/unit/fileformats/nimrod_load_rules/__init__.py b/lib/iris/tests/unit/fileformats/nimrod_load_rules/__init__.py
index 429ee9ce1f..928c9d9361 100644
--- a/lib/iris/tests/unit/fileformats/nimrod_load_rules/__init__.py
+++ b/lib/iris/tests/unit/fileformats/nimrod_load_rules/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.fileformats.nimrod_load_rules` module."""
diff --git a/lib/iris/tests/unit/fileformats/nimrod_load_rules/test_units.py b/lib/iris/tests/unit/fileformats/nimrod_load_rules/test_units.py
index a15337f849..c15a721ad3 100644
--- a/lib/iris/tests/unit/fileformats/nimrod_load_rules/test_units.py
+++ b/lib/iris/tests/unit/fileformats/nimrod_load_rules/test_units.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the `iris.fileformats.nimrod_load_rules.units` function.
 
diff --git a/lib/iris/tests/unit/fileformats/nimrod_load_rules/test_vertical_coord.py b/lib/iris/tests/unit/fileformats/nimrod_load_rules/test_vertical_coord.py
index 2279bcffc3..4f1b948839 100644
--- a/lib/iris/tests/unit/fileformats/nimrod_load_rules/test_vertical_coord.py
+++ b/lib/iris/tests/unit/fileformats/nimrod_load_rules/test_vertical_coord.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the `iris.fileformats.nimrod_load_rules.vertical_coord`
 function.
diff --git a/lib/iris/tests/unit/fileformats/pp/__init__.py b/lib/iris/tests/unit/fileformats/pp/__init__.py
index f309b6848a..7eedc830d9 100644
--- a/lib/iris/tests/unit/fileformats/pp/__init__.py
+++ b/lib/iris/tests/unit/fileformats/pp/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.fileformats.pp` module."""
diff --git a/lib/iris/tests/unit/fileformats/pp/test_PPDataProxy.py b/lib/iris/tests/unit/fileformats/pp/test_PPDataProxy.py
index d70e573296..4d963e7f08 100644
--- a/lib/iris/tests/unit/fileformats/pp/test_PPDataProxy.py
+++ b/lib/iris/tests/unit/fileformats/pp/test_PPDataProxy.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.fileformats.pp.PPDataProxy` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/pp/test_PPField.py b/lib/iris/tests/unit/fileformats/pp/test_PPField.py
index f2bbf97a80..1a49f57712 100644
--- a/lib/iris/tests/unit/fileformats/pp/test_PPField.py
+++ b/lib/iris/tests/unit/fileformats/pp/test_PPField.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.fileformats.pp.PPField` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/pp/test__convert_constraints.py b/lib/iris/tests/unit/fileformats/pp/test__convert_constraints.py
index 514e326393..cca9bb4641 100644
--- a/lib/iris/tests/unit/fileformats/pp/test__convert_constraints.py
+++ b/lib/iris/tests/unit/fileformats/pp/test__convert_constraints.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.fileformats.pp.load` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/pp/test__create_field_data.py b/lib/iris/tests/unit/fileformats/pp/test__create_field_data.py
index 16d2b500a5..ab80332186 100644
--- a/lib/iris/tests/unit/fileformats/pp/test__create_field_data.py
+++ b/lib/iris/tests/unit/fileformats/pp/test__create_field_data.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.fileformats.pp._create_field_data` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/pp/test__data_bytes_to_shaped_array.py b/lib/iris/tests/unit/fileformats/pp/test__data_bytes_to_shaped_array.py
index 73913c6219..45635af391 100644
--- a/lib/iris/tests/unit/fileformats/pp/test__data_bytes_to_shaped_array.py
+++ b/lib/iris/tests/unit/fileformats/pp/test__data_bytes_to_shaped_array.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the `iris.fileformats.pp._data_bytes_to_shaped_array` function.
 
diff --git a/lib/iris/tests/unit/fileformats/pp/test__field_gen.py b/lib/iris/tests/unit/fileformats/pp/test__field_gen.py
index 31ac4f6b19..80b90fc8d2 100644
--- a/lib/iris/tests/unit/fileformats/pp/test__field_gen.py
+++ b/lib/iris/tests/unit/fileformats/pp/test__field_gen.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.fileformats.pp._field_gen` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/pp/test__interpret_field.py b/lib/iris/tests/unit/fileformats/pp/test__interpret_field.py
index 0b83cade76..aa03c068ce 100644
--- a/lib/iris/tests/unit/fileformats/pp/test__interpret_field.py
+++ b/lib/iris/tests/unit/fileformats/pp/test__interpret_field.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.fileformats.pp._interpret_field` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/pp/test_as_fields.py b/lib/iris/tests/unit/fileformats/pp/test_as_fields.py
index 3ff228e106..213eb6c9c4 100644
--- a/lib/iris/tests/unit/fileformats/pp/test_as_fields.py
+++ b/lib/iris/tests/unit/fileformats/pp/test_as_fields.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.fileformats.pp.as_fields` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/pp/test_load.py b/lib/iris/tests/unit/fileformats/pp/test_load.py
index 77da1288c2..e802b36c0e 100644
--- a/lib/iris/tests/unit/fileformats/pp/test_load.py
+++ b/lib/iris/tests/unit/fileformats/pp/test_load.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.fileformats.pp.load` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/pp/test_save.py b/lib/iris/tests/unit/fileformats/pp/test_save.py
index 8200259cca..fc0535f428 100644
--- a/lib/iris/tests/unit/fileformats/pp/test_save.py
+++ b/lib/iris/tests/unit/fileformats/pp/test_save.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.fileformats.pp.save` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/pp/test_save_fields.py b/lib/iris/tests/unit/fileformats/pp/test_save_fields.py
index fdd470cb47..2eaebc0059 100644
--- a/lib/iris/tests/unit/fileformats/pp/test_save_fields.py
+++ b/lib/iris/tests/unit/fileformats/pp/test_save_fields.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.fileformats.pp.save_fields` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/pp/test_save_pairs_from_cube.py b/lib/iris/tests/unit/fileformats/pp/test_save_pairs_from_cube.py
index cdd3c9cd49..5ab3f7c480 100644
--- a/lib/iris/tests/unit/fileformats/pp/test_save_pairs_from_cube.py
+++ b/lib/iris/tests/unit/fileformats/pp/test_save_pairs_from_cube.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.fileformats.pp.save_pairs_from_cube` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/pp_load_rules/__init__.py b/lib/iris/tests/unit/fileformats/pp_load_rules/__init__.py
index 70d28f7c09..c8361feae4 100644
--- a/lib/iris/tests/unit/fileformats/pp_load_rules/__init__.py
+++ b/lib/iris/tests/unit/fileformats/pp_load_rules/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.fileformats.pp_load_rules` module."""
diff --git a/lib/iris/tests/unit/fileformats/pp_load_rules/test__all_other_rules.py b/lib/iris/tests/unit/fileformats/pp_load_rules/test__all_other_rules.py
index e194e240c6..591bfda857 100644
--- a/lib/iris/tests/unit/fileformats/pp_load_rules/test__all_other_rules.py
+++ b/lib/iris/tests/unit/fileformats/pp_load_rules/test__all_other_rules.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the `iris.fileformats.pp_load_rules._all_other_rules` function.
 
diff --git a/lib/iris/tests/unit/fileformats/pp_load_rules/test__collapse_degenerate_points_and_bounds.py b/lib/iris/tests/unit/fileformats/pp_load_rules/test__collapse_degenerate_points_and_bounds.py
index c9c4821e0a..c87e199956 100644
--- a/lib/iris/tests/unit/fileformats/pp_load_rules/test__collapse_degenerate_points_and_bounds.py
+++ b/lib/iris/tests/unit/fileformats/pp_load_rules/test__collapse_degenerate_points_and_bounds.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for
 :func:`iris.fileformats.pp_load_rules._collapse_degenerate_points_and_bounds`.
diff --git a/lib/iris/tests/unit/fileformats/pp_load_rules/test__convert_scalar_pseudo_level_coords.py b/lib/iris/tests/unit/fileformats/pp_load_rules/test__convert_scalar_pseudo_level_coords.py
index d3046ee63e..803e47227f 100644
--- a/lib/iris/tests/unit/fileformats/pp_load_rules/test__convert_scalar_pseudo_level_coords.py
+++ b/lib/iris/tests/unit/fileformats/pp_load_rules/test__convert_scalar_pseudo_level_coords.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for
 :func:`iris.fileformats.pp_load_rules._convert_pseudo_level_coords`.
diff --git a/lib/iris/tests/unit/fileformats/pp_load_rules/test__convert_scalar_realization_coords.py b/lib/iris/tests/unit/fileformats/pp_load_rules/test__convert_scalar_realization_coords.py
index 759a399dad..6159a1dbd4 100644
--- a/lib/iris/tests/unit/fileformats/pp_load_rules/test__convert_scalar_realization_coords.py
+++ b/lib/iris/tests/unit/fileformats/pp_load_rules/test__convert_scalar_realization_coords.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for
 :func:`iris.fileformats.pp_load_rules._convert_scalar_realization_coords`.
diff --git a/lib/iris/tests/unit/fileformats/pp_load_rules/test__convert_time_coords.py b/lib/iris/tests/unit/fileformats/pp_load_rules/test__convert_time_coords.py
index cf147e5928..5afaeee45d 100644
--- a/lib/iris/tests/unit/fileformats/pp_load_rules/test__convert_time_coords.py
+++ b/lib/iris/tests/unit/fileformats/pp_load_rules/test__convert_time_coords.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for
 :func:`iris.fileformats.pp_load_rules._convert_time_coords`.
diff --git a/lib/iris/tests/unit/fileformats/pp_load_rules/test__convert_vertical_coords.py b/lib/iris/tests/unit/fileformats/pp_load_rules/test__convert_vertical_coords.py
index 47552a646a..a7ed6355f6 100644
--- a/lib/iris/tests/unit/fileformats/pp_load_rules/test__convert_vertical_coords.py
+++ b/lib/iris/tests/unit/fileformats/pp_load_rules/test__convert_vertical_coords.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for
 :func:`iris.fileformats.pp_load_rules._convert_vertical_coords`.
diff --git a/lib/iris/tests/unit/fileformats/pp_load_rules/test__dim_or_aux.py b/lib/iris/tests/unit/fileformats/pp_load_rules/test__dim_or_aux.py
index 7769ca1de1..176d0a38a1 100644
--- a/lib/iris/tests/unit/fileformats/pp_load_rules/test__dim_or_aux.py
+++ b/lib/iris/tests/unit/fileformats/pp_load_rules/test__dim_or_aux.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :func:`iris.fileformats.pp_load_rules._dim_or_aux`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/pp_load_rules/test__epoch_date_hours.py b/lib/iris/tests/unit/fileformats/pp_load_rules/test__epoch_date_hours.py
index 2c5d672e14..2724d45871 100644
--- a/lib/iris/tests/unit/fileformats/pp_load_rules/test__epoch_date_hours.py
+++ b/lib/iris/tests/unit/fileformats/pp_load_rules/test__epoch_date_hours.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for
 :func:`iris.fileformats.pp_load_rules._epoch_date_hours`.
diff --git a/lib/iris/tests/unit/fileformats/pp_load_rules/test__model_level_number.py b/lib/iris/tests/unit/fileformats/pp_load_rules/test__model_level_number.py
index fa381b91c1..c99de5bc34 100644
--- a/lib/iris/tests/unit/fileformats/pp_load_rules/test__model_level_number.py
+++ b/lib/iris/tests/unit/fileformats/pp_load_rules/test__model_level_number.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for :func:`iris.fileformats.pp_load_rules._model_level_number`.
 
diff --git a/lib/iris/tests/unit/fileformats/pp_load_rules/test__reduced_points_and_bounds.py b/lib/iris/tests/unit/fileformats/pp_load_rules/test__reduced_points_and_bounds.py
index fc30f66f7f..a33128f39b 100644
--- a/lib/iris/tests/unit/fileformats/pp_load_rules/test__reduced_points_and_bounds.py
+++ b/lib/iris/tests/unit/fileformats/pp_load_rules/test__reduced_points_and_bounds.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for
 :func:`iris.fileformats.pp_load_rules._reduce_points_and_bounds`.
diff --git a/lib/iris/tests/unit/fileformats/pp_load_rules/test__reshape_vector_args.py b/lib/iris/tests/unit/fileformats/pp_load_rules/test__reshape_vector_args.py
index 4e6d50fea7..d12a718e98 100644
--- a/lib/iris/tests/unit/fileformats/pp_load_rules/test__reshape_vector_args.py
+++ b/lib/iris/tests/unit/fileformats/pp_load_rules/test__reshape_vector_args.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for
 :func:`iris.fileformats.pp_load_rules._reshape_vector_args`.
diff --git a/lib/iris/tests/unit/fileformats/pp_load_rules/test_convert.py b/lib/iris/tests/unit/fileformats/pp_load_rules/test_convert.py
index 569d676183..0b46d11f9d 100644
--- a/lib/iris/tests/unit/fileformats/pp_load_rules/test_convert.py
+++ b/lib/iris/tests/unit/fileformats/pp_load_rules/test_convert.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :func:`iris.fileformats.pp_load_rules.convert`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/rules/__init__.py b/lib/iris/tests/unit/fileformats/rules/__init__.py
index 55c9c7779e..1b14a8b07b 100644
--- a/lib/iris/tests/unit/fileformats/rules/__init__.py
+++ b/lib/iris/tests/unit/fileformats/rules/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.fileformats.rules` module."""
diff --git a/lib/iris/tests/unit/fileformats/rules/test_Loader.py b/lib/iris/tests/unit/fileformats/rules/test_Loader.py
index be96f526d2..b99d1e6f40 100644
--- a/lib/iris/tests/unit/fileformats/rules/test_Loader.py
+++ b/lib/iris/tests/unit/fileformats/rules/test_Loader.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :class:`iris.fileformats.rules.Loader`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/rules/test__make_cube.py b/lib/iris/tests/unit/fileformats/rules/test__make_cube.py
index b6c4528399..91862658e5 100644
--- a/lib/iris/tests/unit/fileformats/rules/test__make_cube.py
+++ b/lib/iris/tests/unit/fileformats/rules/test__make_cube.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :func:`iris.fileformats.rules._make_cube`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/structured_array_identification/__init__.py b/lib/iris/tests/unit/fileformats/structured_array_identification/__init__.py
index c703284fc0..8a0a9a38d7 100644
--- a/lib/iris/tests/unit/fileformats/structured_array_identification/__init__.py
+++ b/lib/iris/tests/unit/fileformats/structured_array_identification/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the
 :mod:`iris.fileformats._structured_array_identification` module.
diff --git a/lib/iris/tests/unit/fileformats/structured_array_identification/test_ArrayStructure.py b/lib/iris/tests/unit/fileformats/structured_array_identification/test_ArrayStructure.py
index 871aab4f1e..9f5466afaa 100644
--- a/lib/iris/tests/unit/fileformats/structured_array_identification/test_ArrayStructure.py
+++ b/lib/iris/tests/unit/fileformats/structured_array_identification/test_ArrayStructure.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the
 :mod:`iris.fileformats._structured_array_identification.ArrayStructure` class.
diff --git a/lib/iris/tests/unit/fileformats/structured_array_identification/test_GroupStructure.py b/lib/iris/tests/unit/fileformats/structured_array_identification/test_GroupStructure.py
index a7818ad802..ec98664f51 100644
--- a/lib/iris/tests/unit/fileformats/structured_array_identification/test_GroupStructure.py
+++ b/lib/iris/tests/unit/fileformats/structured_array_identification/test_GroupStructure.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the
 :mod:`iris.fileformats._structured_array_identification.GroupStructure` class.
diff --git a/lib/iris/tests/unit/fileformats/test_rules.py b/lib/iris/tests/unit/fileformats/test_rules.py
index c243a374cb..b7e17b205e 100644
--- a/lib/iris/tests/unit/fileformats/test_rules.py
+++ b/lib/iris/tests/unit/fileformats/test_rules.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test iris.fileformats.rules.py - metadata translation rules.
 
diff --git a/lib/iris/tests/unit/fileformats/um/__init__.py b/lib/iris/tests/unit/fileformats/um/__init__.py
index 6b4abc61bb..6652c6d543 100644
--- a/lib/iris/tests/unit/fileformats/um/__init__.py
+++ b/lib/iris/tests/unit/fileformats/um/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.fileformats.um` package."""
diff --git a/lib/iris/tests/unit/fileformats/um/fast_load/__init__.py b/lib/iris/tests/unit/fileformats/um/fast_load/__init__.py
index b5eb259e5b..f2c18b5f8a 100644
--- a/lib/iris/tests/unit/fileformats/um/fast_load/__init__.py
+++ b/lib/iris/tests/unit/fileformats/um/fast_load/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the module :mod:`iris.fileformats.um._fast_load`.
 
diff --git a/lib/iris/tests/unit/fileformats/um/fast_load/test_FieldCollation.py b/lib/iris/tests/unit/fileformats/um/fast_load/test_FieldCollation.py
index 0c15e5e839..930050813f 100644
--- a/lib/iris/tests/unit/fileformats/um/fast_load/test_FieldCollation.py
+++ b/lib/iris/tests/unit/fileformats/um/fast_load/test_FieldCollation.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the class
 :class:`iris.fileformats.um._fast_load.FieldCollation`.
diff --git a/lib/iris/tests/unit/fileformats/um/fast_load/test__convert_collation.py b/lib/iris/tests/unit/fileformats/um/fast_load/test__convert_collation.py
index 90c411b41d..f6e3fd5928 100644
--- a/lib/iris/tests/unit/fileformats/um/fast_load/test__convert_collation.py
+++ b/lib/iris/tests/unit/fileformats/um/fast_load/test__convert_collation.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :func:`iris.fileformats.um._fast_load._convert_collation`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/fileformats/um/fast_load_structured_fields/__init__.py b/lib/iris/tests/unit/fileformats/um/fast_load_structured_fields/__init__.py
index f0932c3ac8..c26382aca9 100644
--- a/lib/iris/tests/unit/fileformats/um/fast_load_structured_fields/__init__.py
+++ b/lib/iris/tests/unit/fileformats/um/fast_load_structured_fields/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the module
 :mod:`iris.fileformats.um._fast_load_structured_fields`.
diff --git a/lib/iris/tests/unit/fileformats/um/fast_load_structured_fields/test_BasicFieldCollation.py b/lib/iris/tests/unit/fileformats/um/fast_load_structured_fields/test_BasicFieldCollation.py
index 57100c79af..19c64ec57a 100644
--- a/lib/iris/tests/unit/fileformats/um/fast_load_structured_fields/test_BasicFieldCollation.py
+++ b/lib/iris/tests/unit/fileformats/um/fast_load_structured_fields/test_BasicFieldCollation.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the class
 :class:`iris.fileformats.um._fast_load_structured_fields.BasicFieldCollation`.
diff --git a/lib/iris/tests/unit/fileformats/um/fast_load_structured_fields/test_group_structured_fields.py b/lib/iris/tests/unit/fileformats/um/fast_load_structured_fields/test_group_structured_fields.py
index b7ef9a62a3..75b54dfd4f 100644
--- a/lib/iris/tests/unit/fileformats/um/fast_load_structured_fields/test_group_structured_fields.py
+++ b/lib/iris/tests/unit/fileformats/um/fast_load_structured_fields/test_group_structured_fields.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the function :func:\
 `iris.fileformats.um._fast_load_structured_fields.group_structured_fields`.
diff --git a/lib/iris/tests/unit/fileformats/um/optimal_array_structuring/__init__.py b/lib/iris/tests/unit/fileformats/um/optimal_array_structuring/__init__.py
index 8070719de8..5a72973519 100644
--- a/lib/iris/tests/unit/fileformats/um/optimal_array_structuring/__init__.py
+++ b/lib/iris/tests/unit/fileformats/um/optimal_array_structuring/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the module
 :mod:`iris.fileformats.um._optimal_array_structuring`.
diff --git a/lib/iris/tests/unit/fileformats/um/optimal_array_structuring/test_optimal_array_structure.py b/lib/iris/tests/unit/fileformats/um/optimal_array_structuring/test_optimal_array_structure.py
index 96566f3c80..92a8b19ec0 100644
--- a/lib/iris/tests/unit/fileformats/um/optimal_array_structuring/test_optimal_array_structure.py
+++ b/lib/iris/tests/unit/fileformats/um/optimal_array_structuring/test_optimal_array_structure.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the function
 :func:`iris.fileformats.um._optimal_array_structuring.optimal_array_structure`.
diff --git a/lib/iris/tests/unit/fileformats/um/test_um_to_pp.py b/lib/iris/tests/unit/fileformats/um/test_um_to_pp.py
index ef6369f638..40ac6826d3 100644
--- a/lib/iris/tests/unit/fileformats/um/test_um_to_pp.py
+++ b/lib/iris/tests/unit/fileformats/um/test_um_to_pp.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the function
 :func:`iris.fileformats.um.um_to_pp`.
diff --git a/lib/iris/tests/unit/io/__init__.py b/lib/iris/tests/unit/io/__init__.py
index 5e347c9ebc..1a11fe5d30 100644
--- a/lib/iris/tests/unit/io/__init__.py
+++ b/lib/iris/tests/unit/io/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.io` package."""
diff --git a/lib/iris/tests/unit/io/test__generate_cubes.py b/lib/iris/tests/unit/io/test__generate_cubes.py
index 3a896a111c..96d790db2d 100755
--- a/lib/iris/tests/unit/io/test__generate_cubes.py
+++ b/lib/iris/tests/unit/io/test__generate_cubes.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.io._generate_cubes` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/io/test_expand_filespecs.py b/lib/iris/tests/unit/io/test_expand_filespecs.py
index 8720478153..bd5e5933a3 100644
--- a/lib/iris/tests/unit/io/test_expand_filespecs.py
+++ b/lib/iris/tests/unit/io/test_expand_filespecs.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.io.expand_filespecs` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/io/test_run_callback.py b/lib/iris/tests/unit/io/test_run_callback.py
index 94ae7ac09d..cd55743b29 100644
--- a/lib/iris/tests/unit/io/test_run_callback.py
+++ b/lib/iris/tests/unit/io/test_run_callback.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.io.run_callback` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/io/test_save.py b/lib/iris/tests/unit/io/test_save.py
index 623cf417f2..cec125d0fe 100755
--- a/lib/iris/tests/unit/io/test_save.py
+++ b/lib/iris/tests/unit/io/test_save.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.io.save` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/lazy_data/__init__.py b/lib/iris/tests/unit/lazy_data/__init__.py
index b463897c50..55920077f3 100644
--- a/lib/iris/tests/unit/lazy_data/__init__.py
+++ b/lib/iris/tests/unit/lazy_data/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris._lazy_data` module."""
diff --git a/lib/iris/tests/unit/lazy_data/test_as_concrete_data.py b/lib/iris/tests/unit/lazy_data/test_as_concrete_data.py
index 1a98c81fac..91b22a3c0e 100644
--- a/lib/iris/tests/unit/lazy_data/test_as_concrete_data.py
+++ b/lib/iris/tests/unit/lazy_data/test_as_concrete_data.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris._lazy data.as_concrete_data`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/lazy_data/test_as_lazy_data.py b/lib/iris/tests/unit/lazy_data/test_as_lazy_data.py
index 5f9dece153..0acb085830 100644
--- a/lib/iris/tests/unit/lazy_data/test_as_lazy_data.py
+++ b/lib/iris/tests/unit/lazy_data/test_as_lazy_data.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test the function :func:`iris._lazy data.as_lazy_data`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/lazy_data/test_co_realise_cubes.py b/lib/iris/tests/unit/lazy_data/test_co_realise_cubes.py
index 0c10d69c16..3b265d615d 100644
--- a/lib/iris/tests/unit/lazy_data/test_co_realise_cubes.py
+++ b/lib/iris/tests/unit/lazy_data/test_co_realise_cubes.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris._lazy data.co_realise_cubes`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/lazy_data/test_is_lazy_data.py b/lib/iris/tests/unit/lazy_data/test_is_lazy_data.py
index 45b3194f32..a8018c67b1 100644
--- a/lib/iris/tests/unit/lazy_data/test_is_lazy_data.py
+++ b/lib/iris/tests/unit/lazy_data/test_is_lazy_data.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris._lazy data.is_lazy_data`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/lazy_data/test_is_lazy_masked_data.py b/lib/iris/tests/unit/lazy_data/test_is_lazy_masked_data.py
index 4d627a706b..6466ab0ea2 100644
--- a/lib/iris/tests/unit/lazy_data/test_is_lazy_masked_data.py
+++ b/lib/iris/tests/unit/lazy_data/test_is_lazy_masked_data.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris._lazy data.is_lazy_masked_data`."""
 
 import dask.array as da
diff --git a/lib/iris/tests/unit/lazy_data/test_lazy_elementwise.py b/lib/iris/tests/unit/lazy_data/test_lazy_elementwise.py
index 49fd6ad70b..651a774c4d 100644
--- a/lib/iris/tests/unit/lazy_data/test_lazy_elementwise.py
+++ b/lib/iris/tests/unit/lazy_data/test_lazy_elementwise.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris._lazy data.lazy_elementwise`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/lazy_data/test_map_complete_blocks.py b/lib/iris/tests/unit/lazy_data/test_map_complete_blocks.py
index 66c03d04c8..1c694d292b 100644
--- a/lib/iris/tests/unit/lazy_data/test_map_complete_blocks.py
+++ b/lib/iris/tests/unit/lazy_data/test_map_complete_blocks.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris._lazy data.map_complete_blocks`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/lazy_data/test_multidim_lazy_stack.py b/lib/iris/tests/unit/lazy_data/test_multidim_lazy_stack.py
index 9fe79a0d4c..993cb01178 100644
--- a/lib/iris/tests/unit/lazy_data/test_multidim_lazy_stack.py
+++ b/lib/iris/tests/unit/lazy_data/test_multidim_lazy_stack.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris._lazy data.multidim_lazy_stack`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/lazy_data/test_non_lazy.py b/lib/iris/tests/unit/lazy_data/test_non_lazy.py
index cc4ed33ea3..3c6bb99e0a 100644
--- a/lib/iris/tests/unit/lazy_data/test_non_lazy.py
+++ b/lib/iris/tests/unit/lazy_data/test_non_lazy.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris._lazy data.non_lazy`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/merge/__init__.py b/lib/iris/tests/unit/merge/__init__.py
index c3ead61576..14ef96573f 100644
--- a/lib/iris/tests/unit/merge/__init__.py
+++ b/lib/iris/tests/unit/merge/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris._merge` module."""
diff --git a/lib/iris/tests/unit/merge/test_ProtoCube.py b/lib/iris/tests/unit/merge/test_ProtoCube.py
index 0fca726b28..80f135e108 100644
--- a/lib/iris/tests/unit/merge/test_ProtoCube.py
+++ b/lib/iris/tests/unit/merge/test_ProtoCube.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris._merge.ProtoCube` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/pandas/__init__.py b/lib/iris/tests/unit/pandas/__init__.py
index 103a264839..2ee1fb1cfe 100644
--- a/lib/iris/tests/unit/pandas/__init__.py
+++ b/lib/iris/tests/unit/pandas/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.pandas` module."""
diff --git a/lib/iris/tests/unit/pandas/test_pandas.py b/lib/iris/tests/unit/pandas/test_pandas.py
index d74d7cad9c..6f617439db 100644
--- a/lib/iris/tests/unit/pandas/test_pandas.py
+++ b/lib/iris/tests/unit/pandas/test_pandas.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """All unit tests for the :mod:`iris.pandas` module."""
 
 # import iris tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/plot/__init__.py b/lib/iris/tests/unit/plot/__init__.py
index f589a29e0d..7481cdafa3 100644
--- a/lib/iris/tests/unit/plot/__init__.py
+++ b/lib/iris/tests/unit/plot/__init__.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.plot` module."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/plot/_blockplot_common.py b/lib/iris/tests/unit/plot/_blockplot_common.py
index 455b416164..e3e88304fa 100644
--- a/lib/iris/tests/unit/plot/_blockplot_common.py
+++ b/lib/iris/tests/unit/plot/_blockplot_common.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Common test code for `iris.plot.pcolor` and `iris.plot.pcolormesh`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/plot/test__check_bounds_contiguity_and_mask.py b/lib/iris/tests/unit/plot/test__check_bounds_contiguity_and_mask.py
index 4dfc6d7f68..3e25f0aadb 100644
--- a/lib/iris/tests/unit/plot/test__check_bounds_contiguity_and_mask.py
+++ b/lib/iris/tests/unit/plot/test__check_bounds_contiguity_and_mask.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.plot._check_bounds_contiguity_and_mask`
 function."""
 
diff --git a/lib/iris/tests/unit/plot/test__check_geostationary_coords_and_convert.py b/lib/iris/tests/unit/plot/test__check_geostationary_coords_and_convert.py
index a06a437396..cfbb15cdef 100644
--- a/lib/iris/tests/unit/plot/test__check_geostationary_coords_and_convert.py
+++ b/lib/iris/tests/unit/plot/test__check_geostationary_coords_and_convert.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.plot._check_geostationary_coords_and_convert
 function."""
 
diff --git a/lib/iris/tests/unit/plot/test__fixup_dates.py b/lib/iris/tests/unit/plot/test__fixup_dates.py
index 0abef01e41..d155f30969 100644
--- a/lib/iris/tests/unit/plot/test__fixup_dates.py
+++ b/lib/iris/tests/unit/plot/test__fixup_dates.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.plot._fixup_dates` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/plot/test__get_plot_defn.py b/lib/iris/tests/unit/plot/test__get_plot_defn.py
index c69173dc70..512dc7f0b2 100644
--- a/lib/iris/tests/unit/plot/test__get_plot_defn.py
+++ b/lib/iris/tests/unit/plot/test__get_plot_defn.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.plot._get_plot_defn` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/plot/test__get_plot_defn_custom_coords_picked.py b/lib/iris/tests/unit/plot/test__get_plot_defn_custom_coords_picked.py
index 631f9bd24e..dcd8fac9e1 100644
--- a/lib/iris/tests/unit/plot/test__get_plot_defn_custom_coords_picked.py
+++ b/lib/iris/tests/unit/plot/test__get_plot_defn_custom_coords_picked.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.plot._get_plot_defn_custom_coords_picked`
 function."""
 
diff --git a/lib/iris/tests/unit/plot/test__get_plot_objects.py b/lib/iris/tests/unit/plot/test__get_plot_objects.py
index 8586faa756..fbccbe94fb 100644
--- a/lib/iris/tests/unit/plot/test__get_plot_objects.py
+++ b/lib/iris/tests/unit/plot/test__get_plot_objects.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.plot._get_plot_objects` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/plot/test__replace_axes_with_cartopy_axes.py b/lib/iris/tests/unit/plot/test__replace_axes_with_cartopy_axes.py
index 8e2d4f226b..8d4054b35a 100644
--- a/lib/iris/tests/unit/plot/test__replace_axes_with_cartopy_axes.py
+++ b/lib/iris/tests/unit/plot/test__replace_axes_with_cartopy_axes.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.plot.__replace_axes_with_cartopy_axes` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/plot/test_contour.py b/lib/iris/tests/unit/plot/test_contour.py
index 823b3270d0..43c0564ff4 100644
--- a/lib/iris/tests/unit/plot/test_contour.py
+++ b/lib/iris/tests/unit/plot/test_contour.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.plot.contour` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/plot/test_contourf.py b/lib/iris/tests/unit/plot/test_contourf.py
index de84e88a52..64ab87f879 100644
--- a/lib/iris/tests/unit/plot/test_contourf.py
+++ b/lib/iris/tests/unit/plot/test_contourf.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.plot.contourf` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/plot/test_hist.py b/lib/iris/tests/unit/plot/test_hist.py
index 8a74ff8701..feef8f1062 100644
--- a/lib/iris/tests/unit/plot/test_hist.py
+++ b/lib/iris/tests/unit/plot/test_hist.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.plot.hist` function."""
 # Import iris.tests first so that some things can be initialised before
 # importing anything else.
diff --git a/lib/iris/tests/unit/plot/test_outline.py b/lib/iris/tests/unit/plot/test_outline.py
index de59287362..dc1b27487b 100644
--- a/lib/iris/tests/unit/plot/test_outline.py
+++ b/lib/iris/tests/unit/plot/test_outline.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.plot.outline` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/plot/test_pcolor.py b/lib/iris/tests/unit/plot/test_pcolor.py
index 1cde9e8822..219df4d446 100644
--- a/lib/iris/tests/unit/plot/test_pcolor.py
+++ b/lib/iris/tests/unit/plot/test_pcolor.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.plot.pcolor` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/plot/test_pcolormesh.py b/lib/iris/tests/unit/plot/test_pcolormesh.py
index f4e84e5765..a5525770f2 100644
--- a/lib/iris/tests/unit/plot/test_pcolormesh.py
+++ b/lib/iris/tests/unit/plot/test_pcolormesh.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.plot.pcolormesh` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/plot/test_plot.py b/lib/iris/tests/unit/plot/test_plot.py
index 1ed2da1b13..db33862a7e 100644
--- a/lib/iris/tests/unit/plot/test_plot.py
+++ b/lib/iris/tests/unit/plot/test_plot.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.plot.plot` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/plot/test_points.py b/lib/iris/tests/unit/plot/test_points.py
index e1a23eff83..0d713e3d84 100644
--- a/lib/iris/tests/unit/plot/test_points.py
+++ b/lib/iris/tests/unit/plot/test_points.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.plot.points` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/plot/test_scatter.py b/lib/iris/tests/unit/plot/test_scatter.py
index c5cd9cb2f2..f3b2ec1592 100644
--- a/lib/iris/tests/unit/plot/test_scatter.py
+++ b/lib/iris/tests/unit/plot/test_scatter.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.plot.scatter` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/quickplot/__init__.py b/lib/iris/tests/unit/quickplot/__init__.py
index 471ef0f6a5..1ce65d9647 100644
--- a/lib/iris/tests/unit/quickplot/__init__.py
+++ b/lib/iris/tests/unit/quickplot/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.quickplot` module."""
diff --git a/lib/iris/tests/unit/quickplot/test_contour.py b/lib/iris/tests/unit/quickplot/test_contour.py
index 8e3db7c3e0..2f3bb1a45d 100644
--- a/lib/iris/tests/unit/quickplot/test_contour.py
+++ b/lib/iris/tests/unit/quickplot/test_contour.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.quickplot.contour` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/quickplot/test_contourf.py b/lib/iris/tests/unit/quickplot/test_contourf.py
index e510e661ae..55c9940821 100644
--- a/lib/iris/tests/unit/quickplot/test_contourf.py
+++ b/lib/iris/tests/unit/quickplot/test_contourf.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.quickplot.contourf` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/quickplot/test_outline.py b/lib/iris/tests/unit/quickplot/test_outline.py
index 70d96372fa..4dd924b749 100644
--- a/lib/iris/tests/unit/quickplot/test_outline.py
+++ b/lib/iris/tests/unit/quickplot/test_outline.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.quickplot.outline` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/quickplot/test_pcolor.py b/lib/iris/tests/unit/quickplot/test_pcolor.py
index 2e559d6308..79f6904e12 100644
--- a/lib/iris/tests/unit/quickplot/test_pcolor.py
+++ b/lib/iris/tests/unit/quickplot/test_pcolor.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.quickplot.pcolor` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/quickplot/test_pcolormesh.py b/lib/iris/tests/unit/quickplot/test_pcolormesh.py
index 32ae3ed716..826f0e7121 100644
--- a/lib/iris/tests/unit/quickplot/test_pcolormesh.py
+++ b/lib/iris/tests/unit/quickplot/test_pcolormesh.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.quickplot.pcolormesh` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/quickplot/test_plot.py b/lib/iris/tests/unit/quickplot/test_plot.py
index 0a36a3fa4e..35e1eae470 100644
--- a/lib/iris/tests/unit/quickplot/test_plot.py
+++ b/lib/iris/tests/unit/quickplot/test_plot.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.quickplot.plot` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/quickplot/test_points.py b/lib/iris/tests/unit/quickplot/test_points.py
index 3810cdd343..b28c37bf87 100644
--- a/lib/iris/tests/unit/quickplot/test_points.py
+++ b/lib/iris/tests/unit/quickplot/test_points.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.quickplot.points` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/quickplot/test_scatter.py b/lib/iris/tests/unit/quickplot/test_scatter.py
index c1cf853970..db3e9948a0 100644
--- a/lib/iris/tests/unit/quickplot/test_scatter.py
+++ b/lib/iris/tests/unit/quickplot/test_scatter.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.quickplot.scatter` function."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/representation/__init__.py b/lib/iris/tests/unit/representation/__init__.py
index e943ad149b..19824735c1 100644
--- a/lib/iris/tests/unit/representation/__init__.py
+++ b/lib/iris/tests/unit/representation/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris._representation` module."""
diff --git a/lib/iris/tests/unit/representation/cube_printout/__init__.py b/lib/iris/tests/unit/representation/cube_printout/__init__.py
index 50ab3f8e45..15e84606db 100644
--- a/lib/iris/tests/unit/representation/cube_printout/__init__.py
+++ b/lib/iris/tests/unit/representation/cube_printout/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris._representation.cube_printout` module."""
diff --git a/lib/iris/tests/unit/representation/cube_printout/test_CubePrintout.py b/lib/iris/tests/unit/representation/cube_printout/test_CubePrintout.py
index 65fb115243..20d5c47e01 100644
--- a/lib/iris/tests/unit/representation/cube_printout/test_CubePrintout.py
+++ b/lib/iris/tests/unit/representation/cube_printout/test_CubePrintout.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :class:`iris._representation.cube_printout.CubePrintout`."""
 import iris.tests as tests  # isort:skip
 
diff --git a/lib/iris/tests/unit/representation/cube_printout/test_Table.py b/lib/iris/tests/unit/representation/cube_printout/test_Table.py
index e5dba52c61..ff9b6cf51b 100644
--- a/lib/iris/tests/unit/representation/cube_printout/test_Table.py
+++ b/lib/iris/tests/unit/representation/cube_printout/test_Table.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :class:`iris._representation.cube_printout.Table`."""
 from iris._representation.cube_printout import Table
 import iris.tests as tests
diff --git a/lib/iris/tests/unit/representation/cube_summary/__init__.py b/lib/iris/tests/unit/representation/cube_summary/__init__.py
index c20a621ba2..684221e6d2 100644
--- a/lib/iris/tests/unit/representation/cube_summary/__init__.py
+++ b/lib/iris/tests/unit/representation/cube_summary/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris._representation.cube_summary` module."""
diff --git a/lib/iris/tests/unit/representation/cube_summary/test_CubeSummary.py b/lib/iris/tests/unit/representation/cube_summary/test_CubeSummary.py
index d81f680df5..1280c3b38f 100644
--- a/lib/iris/tests/unit/representation/cube_summary/test_CubeSummary.py
+++ b/lib/iris/tests/unit/representation/cube_summary/test_CubeSummary.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :class:`iris._representation.cube_summary.CubeSummary`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/test_Future.py b/lib/iris/tests/unit/test_Future.py
index f0c161b0c4..00f6b82519 100644
--- a/lib/iris/tests/unit/test_Future.py
+++ b/lib/iris/tests/unit/test_Future.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.Future` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/test_sample_data_path.py b/lib/iris/tests/unit/test_sample_data_path.py
index ebf3b8108c..aff2c1088f 100644
--- a/lib/iris/tests/unit/test_sample_data_path.py
+++ b/lib/iris/tests/unit/test_sample_data_path.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for :func:`iris.sample_data_path` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/tests/__init__.py b/lib/iris/tests/unit/tests/__init__.py
index b8d27d34d3..b0c801b816 100644
--- a/lib/iris/tests/unit/tests/__init__.py
+++ b/lib/iris/tests/unit/tests/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.tests` package."""
diff --git a/lib/iris/tests/unit/tests/stock/__init__.py b/lib/iris/tests/unit/tests/stock/__init__.py
index f91390c2b3..ad31134ad4 100644
--- a/lib/iris/tests/unit/tests/stock/__init__.py
+++ b/lib/iris/tests/unit/tests/stock/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.tests.stock` module."""
diff --git a/lib/iris/tests/unit/tests/stock/test_netcdf.py b/lib/iris/tests/unit/tests/stock/test_netcdf.py
index 54d7b895cc..eb1c289c37 100644
--- a/lib/iris/tests/unit/tests/stock/test_netcdf.py
+++ b/lib/iris/tests/unit/tests/stock/test_netcdf.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.tests.stock.netcdf` module."""
 
 import shutil
diff --git a/lib/iris/tests/unit/tests/test_IrisTest.py b/lib/iris/tests/unit/tests/test_IrisTest.py
index 10de2a7760..ef895e45b6 100644
--- a/lib/iris/tests/unit/tests/test_IrisTest.py
+++ b/lib/iris/tests/unit/tests/test_IrisTest.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.tests.IrisTest` class."""
 
 # import iris tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/time/__init__.py b/lib/iris/tests/unit/time/__init__.py
index 3483b92e62..fdbb082434 100644
--- a/lib/iris/tests/unit/time/__init__.py
+++ b/lib/iris/tests/unit/time/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.time` module."""
diff --git a/lib/iris/tests/unit/time/test_PartialDateTime.py b/lib/iris/tests/unit/time/test_PartialDateTime.py
index cfffafea2c..8223f4a518 100644
--- a/lib/iris/tests/unit/time/test_PartialDateTime.py
+++ b/lib/iris/tests/unit/time/test_PartialDateTime.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the `iris.time.PartialDateTime` class."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/util/__init__.py b/lib/iris/tests/unit/util/__init__.py
index 9aed566a19..ce94a18f4e 100644
--- a/lib/iris/tests/unit/util/__init__.py
+++ b/lib/iris/tests/unit/util/__init__.py
@@ -1,6 +1,5 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Unit tests for the :mod:`iris.util` module."""
diff --git a/lib/iris/tests/unit/util/test__coord_regular.py b/lib/iris/tests/unit/util/test__coord_regular.py
index a5e9aca9ed..bd9f8f3430 100644
--- a/lib/iris/tests/unit/util/test__coord_regular.py
+++ b/lib/iris/tests/unit/util/test__coord_regular.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test elements of :mod:`iris.util` that deal with checking coord regularity.
 Specifically, this module tests the following functions:
diff --git a/lib/iris/tests/unit/util/test__is_circular.py b/lib/iris/tests/unit/util/test__is_circular.py
index e67eb38294..67099f49d6 100644
--- a/lib/iris/tests/unit/util/test__is_circular.py
+++ b/lib/iris/tests/unit/util/test__is_circular.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris.util._is_circular`."""
 
 # import iris tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/util/test__mask_array.py b/lib/iris/tests/unit/util/test__mask_array.py
index 91a5aca1b4..2245576de9 100644
--- a/lib/iris/tests/unit/util/test__mask_array.py
+++ b/lib/iris/tests/unit/util/test__mask_array.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris.util._mask_array"""
 
 import dask.array as da
diff --git a/lib/iris/tests/unit/util/test__slice_data_with_keys.py b/lib/iris/tests/unit/util/test__slice_data_with_keys.py
index 061a2f5b37..9c93041521 100644
--- a/lib/iris/tests/unit/util/test__slice_data_with_keys.py
+++ b/lib/iris/tests/unit/util/test__slice_data_with_keys.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.util._slice_data_with_keys`.
 
diff --git a/lib/iris/tests/unit/util/test_array_equal.py b/lib/iris/tests/unit/util/test_array_equal.py
index 77631907a1..38b9652443 100644
--- a/lib/iris/tests/unit/util/test_array_equal.py
+++ b/lib/iris/tests/unit/util/test_array_equal.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris.util.array_equal`."""
 
 # import iris tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/util/test_broadcast_to_shape.py b/lib/iris/tests/unit/util/test_broadcast_to_shape.py
index 3df1634ba5..c060967edf 100644
--- a/lib/iris/tests/unit/util/test_broadcast_to_shape.py
+++ b/lib/iris/tests/unit/util/test_broadcast_to_shape.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris.util.broadcast_to_shape`."""
 
 # import iris tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/util/test_column_slices_generator.py b/lib/iris/tests/unit/util/test_column_slices_generator.py
index 899c6b98ba..fbb5a8f588 100644
--- a/lib/iris/tests/unit/util/test_column_slices_generator.py
+++ b/lib/iris/tests/unit/util/test_column_slices_generator.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris.util.column_slices_generator`."""
 
 # import iris tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/util/test_demote_dim_coord_to_aux_coord.py b/lib/iris/tests/unit/util/test_demote_dim_coord_to_aux_coord.py
index ec8f9904f1..65e3dec93b 100644
--- a/lib/iris/tests/unit/util/test_demote_dim_coord_to_aux_coord.py
+++ b/lib/iris/tests/unit/util/test_demote_dim_coord_to_aux_coord.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris.util.demote_dim_coord_to_aux_coord`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/util/test_describe_diff.py b/lib/iris/tests/unit/util/test_describe_diff.py
index 0bb13cab94..74bd71389e 100644
--- a/lib/iris/tests/unit/util/test_describe_diff.py
+++ b/lib/iris/tests/unit/util/test_describe_diff.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris.util.describe_diff`."""
 
 # import iris tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/util/test_equalise_attributes.py b/lib/iris/tests/unit/util/test_equalise_attributes.py
index 13aa1e2af4..a4198160a9 100644
--- a/lib/iris/tests/unit/util/test_equalise_attributes.py
+++ b/lib/iris/tests/unit/util/test_equalise_attributes.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Unit tests for the :func:`iris.util.equalise_attributes` function.
 
diff --git a/lib/iris/tests/unit/util/test_file_is_newer_than.py b/lib/iris/tests/unit/util/test_file_is_newer_than.py
index cff878a294..c27f4f1dcb 100644
--- a/lib/iris/tests/unit/util/test_file_is_newer_than.py
+++ b/lib/iris/tests/unit/util/test_file_is_newer_than.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """
 Test function :func:`iris.util.test_file_is_newer`.
 
diff --git a/lib/iris/tests/unit/util/test_find_discontiguities.py b/lib/iris/tests/unit/util/test_find_discontiguities.py
index 9e043c71bd..6965541320 100644
--- a/lib/iris/tests/unit/util/test_find_discontiguities.py
+++ b/lib/iris/tests/unit/util/test_find_discontiguities.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris.util.find_discontiguities"""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/util/test_mask_cube.py b/lib/iris/tests/unit/util/test_mask_cube.py
index 0123d0cca5..7237f0491c 100644
--- a/lib/iris/tests/unit/util/test_mask_cube.py
+++ b/lib/iris/tests/unit/util/test_mask_cube.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris.util.mask_cube"""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/util/test_new_axis.py b/lib/iris/tests/unit/util/test_new_axis.py
index a6374f97ad..197c06e449 100644
--- a/lib/iris/tests/unit/util/test_new_axis.py
+++ b/lib/iris/tests/unit/util/test_new_axis.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris.util.new_axis`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/util/test_promote_aux_coord_to_dim_coord.py b/lib/iris/tests/unit/util/test_promote_aux_coord_to_dim_coord.py
index 0e1e56fee5..8ad9cbf4c2 100644
--- a/lib/iris/tests/unit/util/test_promote_aux_coord_to_dim_coord.py
+++ b/lib/iris/tests/unit/util/test_promote_aux_coord_to_dim_coord.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris.util.promote_aux_coord_to_dim_coord`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/util/test_reverse.py b/lib/iris/tests/unit/util/test_reverse.py
index 7d9a669a9d..b6da468e7f 100644
--- a/lib/iris/tests/unit/util/test_reverse.py
+++ b/lib/iris/tests/unit/util/test_reverse.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris.util.reverse`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/util/test_rolling_window.py b/lib/iris/tests/unit/util/test_rolling_window.py
index 3644da9c9c..533e5d5633 100644
--- a/lib/iris/tests/unit/util/test_rolling_window.py
+++ b/lib/iris/tests/unit/util/test_rolling_window.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris.util.rolling_window`."""
 
 # import iris tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/util/test_squeeze.py b/lib/iris/tests/unit/util/test_squeeze.py
index b5f0a91b99..cb4b55c1e6 100644
--- a/lib/iris/tests/unit/util/test_squeeze.py
+++ b/lib/iris/tests/unit/util/test_squeeze.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris.util.squeeze`."""
 
 # Import iris.tests first so that some things can be initialised before
diff --git a/lib/iris/tests/unit/util/test_unify_time_units.py b/lib/iris/tests/unit/util/test_unify_time_units.py
index 8bee046dad..2d7a3b6d64 100644
--- a/lib/iris/tests/unit/util/test_unify_time_units.py
+++ b/lib/iris/tests/unit/util/test_unify_time_units.py
@@ -1,8 +1,7 @@
 # Copyright Iris contributors
 #
-# This file is part of Iris and is released under the LGPL license.
-# See COPYING and COPYING.LESSER in the root of the repository for full
-# licensing details.
+# This file is part of Iris and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Test function :func:`iris.util.array_equal`."""
 
 # import iris tests first so that some things can be initialised before