12.—(1) In relation to each council there must be—
(a)a chair of the council; and
(b)if the council so determines, a deputy chair of the council.
(2) Neither the chair nor the deputy chair of a council may hold any other position of responsibility while chair or deputy chair unless the position of responsibility falls within section 6(1)(f).
(3) In relation to each committee of a council there must be—
(a)a chair of the committee; and
(b)if the council so determines, a deputy chair of the committee.
(4) In sub-paragraph (3) “committee” includes “sub-committee”.