# The Combined Authorities (Mayoral Elections) Order 2017, Paragraph 20: The official mark


(1) Every ballot paper must contain an appropriate security marking (the official mark).
(2) The official mark must be kept secret, and an interval of not less than five years shall intervene between the use of the same official mark at an election for the same combined authority.
(3) The returning officer may use a different official mark for different purposes at the same election.

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Source: https://www.legislation.gov.uk/ukdsi/2017/9780111151815/schedule/3/paragraph/20 (the official version)
Page: https://openlegislation.uk/draft-combined-authorities-mayoral-elections-order-2017/schedule-3/paragraph-20
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.