3.—(1) The Constituency Members Election Rules shall have effect for the purposes of the election of constituency members of the London Assembly (whether at an ordinary election or in the circumstances mentioned in section 10 (filling a vacancy in an Assembly constituency) of the 1999 Act); but where the election is an ordinary election, those Rules shall have effect subject to the Ordinary Elections Rules.
(2) The London Members Election Rules, with the exception of Part VII, shall have effect for the purposes of the allocation of seats for London members of the London Assembly at any ordinary election; and Part VII of those Rules shall have effect for the purposes of section 11 (filling a vacancy among the London members) of the 1999 Act; but where the election is an ordinary election, those Rules shall have effect subject to the Ordinary Elections Rules.
(3) The Mayoral Election Rules shall have effect for the purposes of—
(a)the election of the Mayor of London; and
(b)any election under subsection (2) of section 16 (filling a vacancy in the office of Mayor(1)) of the 1999 Act,
but where the election is an ordinary election, those Rules shall have effect subject to the Ordinary Elections Rules.
See also section 16(9) of the Greater London Authority Act 1999 for the circumstances in which a vacancy in the office of Mayor is to be left unfilled.