Local Government Act 1993 No 30
Current version for 14 May 2020 to date (accessed 5 June 2020 at 23:17)
Chapter 10 Part 3 Section 285
285   Voting system for election of councillors
The voting system in a contested election of a councillor or councillors is to be—
(a)  optional preferential, if only one councillor is to be elected, or
(b)  proportional, if 2 or more councillors are to be elected.