16.—(1) A person who—
(a)is a member of a committee appointed under section 11 or 12; but
(b)is not a member of the council which appointed that committee,
must not act as a member of that committee until the person has made, and served on the clerk of the council, a declaration in the form set out in Schedule 3.
(2) This section applies to a joint committee and a sub-committee appointed under section 11 or 12 as it applies to a committee appointed under section 11 or 12 except that in relation to a joint committee—
(a)the reference in subsection (1)(b) to the council which appointed that committee is to be taken as a reference to one of the councils which appointed that joint committee; and
(b)the reference in subsection (1) to the clerk of the council is to be taken as a reference to the clerk of every council which appointed that joint committee.