# Scottish Independence Referendum Act 2013, Paragraph 25


(1) The envelope which the counting officer is required by rule 8(1) of the conduct rules to issue to a postal voter is to be marked with the letter “B”.
(2) The counting officer must also issue to a postal voter a smaller envelope which is to be marked with—
(a) the letter “A”,
(b) the words “ballot paper envelope”, and
(c) the number of the ballot paper.

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Source: https://www.legislation.gov.uk/asp/2013/14/schedule/2/paragraph/25 (the official version)
Page: https://openlegislation.uk/scottish-independence-referendum-act-2013/schedule-2/paragraph-25
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.