10Constituency vacancies
(1)This section applies if the seat of an Assembly constituency member returned for an Assembly constituency is vacant.
(2)Subject to subsection (7), an election must be held in the Assembly constituency to fill the vacancy.
(3)At the election, each person entitled to vote only has a constituency vote; and the Assembly constituency member for the Assembly constituency is to be returned under the simple majority system.
(4)The date of the poll at the election must be fixed by the Presiding Officer.
(5)The date must fall within the period of three months beginning with the occurrence of the vacancy.
(6)But if the vacancy does not come to the Presiding Officer’s notice within the period of one month beginning with its occurrence, the date must fall within the period of three months beginning when it does come to the Presiding Officer’s notice.
(7)The election must not be held if it appears to the Presiding Officer that the latest date which may be fixed for the poll would fall within the period of three months ending with the day on which the poll at the next ordinary general election would be held (disregarding section 4).
(8)The standing orders must make provision for determining the date on which a vacancy occurs for the purposes of this section.
(9)A person may not be a candidate in an election to fill a vacancy if the person is—
(a)an Assembly member, or
(b)a candidate in another such election.