# Parliamentary Voting System and Constituencies Act 2011, Paragraph 29


(1) Immediately after receiving a ballot paper the voter must—
(a) proceed into one of the compartments in the polling station and there secretly mark the paper and fold it up so as to conceal the vote, and then
(b) show to the presiding officer the back of the paper, so as to disclose the number and other unique identifying mark, and put the ballot paper so folded up into the ballot box in the presiding officer's presence.
(2) The voter must vote without undue delay, and must leave the polling station as soon as he or she has put the ballot paper into the ballot box.

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Source: https://www.legislation.gov.uk/ukpga/2011/1/schedule/2/paragraph/29 (the official version)
Page: https://openlegislation.uk/parliamentary-voting-system-and-constituencies-act-2011/schedule-2/paragraph-29
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.