Supplementary schemes for areas comprised in regional schemes

(1) In any case where a regional scheme is in operation, the Central Authority may by resolution decide to prepare a scheme, in this Part referred to as “a supplementary scheme”, with respect to any part of the land to which the regional scheme applies, or to adopt with or without modifications, a scheme proposed by all or any of the owners of any such land. (2) A supplementary scheme prepared or adopted under subsection (1) shall incorporate, with or without modifications, all such provisions of the regional scheme as relate to the area to which the supplementary scheme applies and are not inconsistent with the provisions thereof, and may include such additional provisions as appear to be necessary or desirable. (3) A resolution to prepare or adopt a supplementary scheme shall not affect the operation of the regional scheme, but as from the date on which the supplementary scheme comes into operation it shall, so far as respects the area to which it applies, be substituted for the regional scheme.