The Welsh Ministers may by regulations prescribe requirements relating to the size and composition of a committee or sub-committee by which a relevant function is to be discharged.

A relevant local planning authority may not arrange for a relevant function to be discharged by a committee or sub-committee of the authority which fails to satisfy a requirement of regulations under this section.

If a committee or sub-committee discharging a relevant function fails to satisfy such a requirement, paragraph 43 of Schedule 12 to the 1972 Act (validity of proceedings) does not apply in relation to the failure.