amendments or repeals which may have been made prior to 1.2.1991. Annotations are used to give authority for changes and other effects on the legislation you are viewing and to convey editorial information. They appear at the foot of the relevant provision or under the associated heading. Annotations are categorised by annotation type, such as F-notes for textual amendments and I-notes for commencement information (a full list can be found in the Editorial Practice Guide). Each annotation is identified by a sequential reference number. For F-notes, M-notes and X-notes, the number also appears in bold superscript at the relevant location in the text. All annotations contain links to the affecting legislation. X20 24 In section 10(1) of the Rivers (Prevention of Pollution) (Scotland) Act 1965 (which contains provisions with respect to samples of effluent taken at an inspection chamber provided in compliance with a condition imposed under that Act of section 28 of the Rivers (Prevention of Pollution) (Scotland) Act 1951) for the words "this Act or section 28 of the principal Act" there shall be substituted the words "sections 34 to 40 of the Control of Pollution Act 1974". E+W+S Annotations: Annotations are used to give authority for changes and other effects on the legislation you are viewing and to convey editorial information. They appear at the foot of the relevant provision or under the associated heading. Annotations are categorised by annotation type, such as F-notes for textual amendments and I-notes for commencement information (a full list can be