Greater London Authority Act 1999

12 (1) If, at any time during a vacancy in the office of Mayor, a casual vacancy occurs in the office of acting Mayor, the head of the Authority’s paid service shall give notice of the vacancy—

(a) to the Chair of the Assembly, and

(b) to the Deputy Mayor, if there is a holder of that office,

and this Part of this Schedule (other than paragraph 2 above) shall have effect as if a vacancy in the office of Mayor had arisen on the date on which the vacancy in the office of acting Mayor occurs.

(2) For the purposes of this paragraph, the cases in which, and the date on which, a casual vacancy occurs in the office of acting Mayor are the cases in which, and the date on which, a casual vacancy—

(a) occurs in the acting Mayor’s office as an Assembly member; or

(b) would have occurred in the office of Mayor, had the acting Mayor been the Mayor.

(3) Any notice under sub-paragraph (1) above shall be given as soon as practicable after the date on which, by virtue of sub-paragraph (2) above, the vacancy is, in accordance with section 9 or 15 of this Act, to be regarded as occurring.