(1)Every local planning authority shall consider, as soon as practicable after 2nd November 1987, the question for which part or parts of their area a simplified planning zone scheme is desirable, and then shall keep that question under review.
(2)If as a result of their original consideration or of any such review a local planning authority decide that it is desirable to prepare a scheme for any part of their area they shall do so; and a local planning authority may at any time decide—
(a)to make a simplified planning zone scheme, or
(b)to alter a scheme adopted by them, or
(c)with the consent of the Secretary of State, to alter a scheme approved by him.
(3)Schedule 7 has effect with respect to the making and alteration of simplified planning zone schemes and other related matters.