United Kingdom - 2000 Party Finance Law

Part PART I THE ELECTORAL COMMISSION
Title Section 15: Deputy Electoral Commissioners
Section Commission's electoral boundary functions
Article

15

(1)The Commission may appoint Deputy Electoral Commissioners.
(2)The number of Deputy Electoral Commissioners shall not exceed such number as the Commission, with the agreement of the Speaker's Committee, may determine.
(3)A person shall not be appointed as a Deputy Electoral Commissioner if he is a person who (by virtue of section 3(4)) may not be appointed as an Electoral Commissioner.
(4)The functions of a Deputy Electoral Commissioner are limited to serving as a member of any Boundary Committee to which he is appointed.
(5)Schedule 1 contains further provisions about Deputy Electoral Commissioners.

Categories - Extra-parliamentary party (Members' compatibility)
Source http://legislation.data.gov.uk/ukpga/2000/41/enacted/data.htm?wrap=true