# The Padstow Harbour Revision Order 1987, Paragraph 9


(1) Every ballot paper shall be marked with an official mark which shall perforate the ballot paper.
(2) The official mark shall be kept secret and an interval of not less than five years shall intervene between the use of the same official mark at elections.

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Source: https://www.legislation.gov.uk/uksi/1987/420/schedule/1/paragraph/9 (the official version)
Page: https://openlegislation.uk/padstow-harbour-revision-order-1987/schedule-1/paragraph-9
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.