21(1)If the Chief Electoral Officer thinks fit, the same copy of the register of electors may be used under the following provisions for the purposes of the referendum and the relevant elections—U.K.
(a)rule 28(2) of the referendum rules;
(b)rule 37(1) of the Assembly Elections Rules;
(c)rule 34(1) of the Local Elections Rules.
(2)Sub-paragraphs (3) and (4) apply where the same copy of the register is used as mentioned in sub-paragraph (1).
(3)In a case where a ballot paper is delivered at the same time in respect of the referendum and the relevant elections, a single mark must be placed in the register against the number of the elector under—
(a)rule 28(2)(c) of the referendum rules,
(b)rule 37(1)(d) of the Assembly Elections Rules, and
(c)rule 34(1)(d) of the Local Elections Rules.
(4)In any other case, a mark must be placed in the register against the number of the elector identifying the poll to which each ballot paper delivered relates.
(5)In the case of an elector who is added to the register in pursuance of a notice issued under section 13BA(9) of the 1983 Act—
(a)references in this paragraph to the copy of the register of electors are to be read as references to the copy of the notice;
(b)references to a mark being placed in the register of electors are to be read as references to a mark being made on the copy of the notice.