21. For the purposes of securing the appropriate representation of different political groups on a sub-committee falling within section 17(4) of the 1989 Act, the provisions of sections 15 to 17 of the 1989 Act shall, subject to regulation 22, apply to a body described in paragraph (2)(1)(h) of Schedule 1 to that Act as if the body were a relevant authority for the purposes of those provisions; and Part III of these Regulations and regulation 20 shall apply accordingly.
22.—(1) Where a joint committee has power to make appointments to a sub-committee falling within section 17(4) of the 1989 Act it shall not be under a duty to review the representation of different political groups on that sub-committee at the times mentioned in section 15(1) of the 1989 Act but shall carry out such a review—
(a)as soon as practicable after its members are divided into different political groups; and
(b)as soon as practicable after any change in its membership pursuant to a review under section 15(1) of the 1989 Act.
(2) In paragraph (1) “joint committee” means a body described in paragraph 2(1)(h) of Schedule 1 to the 1989 Act.