27.—(1) At an ordinary election, the GLRO may, in addition to a statement by him in an election booklet, include in the booklet information for voters that has been agreed by him with the Electoral Commission.
(2) The information for voters given in the election booklet may include information about—
(a)the office of the Mayor and the London Assembly,
(b)the system of voting at each Authority election,
(c)how to vote in a manner that will ensure a vote is regarded as validly cast, and
subject to paragraph (3), may include any other information given in exercise of the GLRO’s duty under section 69 (encouraging electoral participation) of the 2006 Act.
(3) The information for voters must not contain–
(a)any advertising material,
(b)any material referring to a candidate or a registered party other than by reproduction of a ballot paper which refers equally to all candidates and parties at the ordinary election,
(c)any material referring to the holder, at any time, of the office of Mayor or Assembly member, other than under paragraph (b) as a candidate at the ordinary election.
(4) Information published in an election booklet under this rule must be printed on not more than two sides of A5 paper.