20.—(1) Every local planning authority shall from time to time consider whether any part or additional part of its area should be designated as an area of special control.
(2) An area of special control shall be designated by an area of special control order made by the local planning authority and approved by the Secretary of State, in accordance with the provisions of Schedule 5.
(3) An area of special control order may be revoked or modified by a subsequent order made by the authority and approved by the Secretary of State, in accordance with the provisions of Schedule 5.
(4) Where an area of special control order is in force the local planning authority shall consider at least once in every 5 years whether it should be revoked or modified.
(5) Before making an order under this regulation, a local planning authority shall consult—
(a)where it appears to the authority that the order will be likely to affect any part of the area of a neighbouring local planning authority, that authority;
(b)where the order will relate to any land in a National Park, other than land in a metropolitan county, any district planning authority within whose area any of that land is situated.
(6) A local planning authority shall not exercise its functions under this regulation in the interests of public safety and, in particular, shall disregard the factors mentioned in regulation 3(2)(b).