## Closure Periods

Last published: February 2016 Reviewed: March 2019 

## © Crown Copyright 2019

You may re-use this publication (not including logos) free of charge in any format or medium, under the terms of the Open Government Licence v3.0. To view this licence visit nationalarchives.gov.uk/doc/open-governmentlicence; or write to the Information Policy Team, The National Archives, Kew, Richmond, Surrey, TW9 4DU; or email: psi@nationalarchives.gov.uk. Any enquiries regarding this publication should be sent to us at governmentaudience@nationalarchives.gov.uk 

## Introduction

The following guidance is for government departments making applications for closure at transfer to the Advisory Council on National Records and Archives. Records identified to containing sensitive information and needing to be transferred as closed to The National Archives will have, as part of that closure, a date at which either release would be appropriate or the case for release should be reconsidered1. The two most common closure periods applied are: 

 'rolling 10 years',  'lifetime'. 
 
All closure periods are calculated from the end date of the record, not the date of the sensitive information. However, the date of the sensitive information should be taken into account when calculating the closure period. 

Rolling ten years The National Archives and the Advisory Council advocate a closure period of 'rolling 10 years' for sensitive information where it is not known how long the sensitivity will apply for and no cut off dates are provided for in the Freedom of Information (FOI) Act. These commonly include exemptions 27(1) and 27(2) - International relations, 29 - the Economy, and 31 - Law enforcement. The areas covered are those previously closed under the first criterion, as described in the Open Government White Paper (Cm 2290 - 1993): 

 
Exceptionally sensitive records containing information, the disclosure of which would not be in the public interest in that it would harm defence, international relations, national security (including the maintenance of law and order) or the 
economic interests of the UK and its dependent territories2. 
 The review which resulted in the White Paper said the previous closure periods used - 50, 75 and 100 years - were too lengthy to cover information that fell into this category. Therefore, as circumstances could change over time, it recommended that records be re-reviewed every ten years. This principle continues to be the basis for the closure of this type of information today. 

## Calculating The Closure Period:

For closure, periods of 10 years are applied from the date of the record, not the date of application, therefore round figures are used: 40 years, 50 years, 60 years and so on. Regardless of when records are reviewed, periods of 10 years should be applied. In order to save time working out closure periods - the following can be used as examples, based on the creation dates of the records. 

| Decade of file    | Closure period    |
|-------------------|-------------------|
| end date          |                   |
| 1990s             | 40 years          |
| 1980s             | 50 years          |
| 1970s             | 60 years          |
| 1960s             | 70 years          |
| 1950s             | 80 years          |
| 1940s             | 90 years          |

## Closure Periods: Lifetime Of Individuals.

For personal information and information linked to identifiable living individuals, The National Archives and the Advisory Council advocate a closure period of 'lifetime' of the data subject. This assumes a lifetime of 100 years, but will be graduated down from the age or assumed age of the individual in the record. This not only covers exemption 40(2) - Personal Information, but other exemptions that relate to an individual, for example exemptions 38 - Health and Safety and 41 - 
Information provided in Confidence. 

 
In February 2004 the Advisory Council on National Records and Archives considered and accepted a proposal for the use of a standard closure period, and that a lifetime of 100 years should be assumed. Parallel to this, The National Archives, Society of Archivists, Records Management Society and National Association for Information Management advocated 100 years as the assumed lifetime of an individual in their Code of practice for records managers and archivists under s 51(4) of the Data Protection Act 1998. 

Such access will be subject to closure periods up to a maximum of 100 years, the assumed lifetime of the individual3. This assumption has continued under the Data Protection Act 2018 in the Guide to archiving personal data. 

## 

Lifespan assumption Given the large number of individuals commonly featuring in archive collections, archive services will not be in a position to ascertain whether they are still alive. If it is not known whether a data subject is alive or dead, the following working assumptions can be used: 

 *Assume a lifespan of 100 years*;  If the age of an adult data subject is not known, assume that they were 16 
at the time of the records; 
 If the age of a child data subject is not known, assume person was less 
than 1 at the time of the records4. 

## Calculating The Closure Period:

The closure period is calculated from the end date of the record and should cover remainder of the lifetime of the individual/s. This is 100 years minus the known or estimated age/s of the individual/s. 

 
If a person's age is not known, the personal information in and the contextual evidence of the record should be used to estimate an age and therefore the closure period. If it is obvious the person is an adult then the estimated age should be 16. If it is not obvious what age a person is from contextual evidence, then the full 100 year closure period should be used, for example, where it could be a child who is the victim of crime or resident in a care home. It may be possible from contextual evidence to reduce the closure period, for example because it is known a person has a professional qualification that requires several years of training or where a person is applying for a benefit such as a pension that has a minimum age. 

Where multiple individuals are named in a record, you are required to provide the age of the youngest. There is a need to be as accurate as possible as the Advisory Council may query the closure period based on what is being closed and the other information in the justification. Examples: For an individual aged 37 in 1979, but where the covering dates of the piece are 1977-1981, the stated age should be 'aged 39'. The piece will have a closure period of 61 years. 

                                                          
For multiple individuals, with no known age, but known to be adults, the stated age should be 'youngest aged at least 16'. The piece will have a corresponding closure period of 84 years. In order to save time calculating closure periods - the following can be used, combined with the information in the record. 

 
Age in justification 
Closure period 
No age, but known to be a child 
Ages unknown 
100 years 
No age, but known to be an adult 
Aged at least 16 
84 years 
Aged at least 18 
82 years 
No age, but known to be an adult and over 16, ie. a prisoner  
Aged at least 21 
79 years 
No age, but in a profession requiring a university education, ie. doctor, lawyer, etc 
Aged at least 40 
60 years 
No age, but a senior member of a profession, ie judge, board member No age, but in receipt 
of a pension 
Aged at least 60 
40 years