# The Senedd Cymru (Representation of the People) Order 2025, Rule 28: The official mark

Extent: E+W

(1) Each ballot paper must contain an appropriate security marking (“the official mark”).
(2) The official mark must be kept secret.
(3) An interval of not less than seven years must intervene between the use of the same official mark at an election for the same Senedd constituency.
(4) 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/wsi/2025/864/schedule/5/rule/28 (the official version)
Page: https://openlegislation.uk/senedd-cymru-representation-of-the-people-order-2025/schedule-5/rule-28
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.