The official markU.K.
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Memorandwm Esboniadol
20.—(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 must intervene between the use of the same official mark at any Authority election.
(3) The GLRO may use a different official mark for different purposes at the same election.