2(1)A planning authority may at any time decide to make a simplified planning zone scheme or to alter a scheme adopted by them or, with the consent of the Secretary of State, to alter a scheme approved by him.
(2)An authority who decide to make or alter a simplified planning zone scheme shall—
(a)notify the Secretary of State of their decision as soon as practicable, and
(b)determine the date on which they will begin to prepare the scheme or the alterations.