(1)A local planning authority may at any time submit to the Secretary of State and shall, if so directed by him, submit to him within a period specified in the direction, proposals for such alterations to the structure plan for their area as appear to them to be expedient or, as the case may be, as the Secretary of State may direct.
(2)Such proposals may relate to the whole or part of the area to which the plan relates.
(3)A local planning authority may at any time submit proposals for the repeal and replacement of the structure plan for their area to the Secretary of State.
(4)An authority submitting a proposal under subsection (3) for the repeal and replacement of a structure plan shall at the same time submit to the Secretary of State the structure plan with which they propose that it shall be replaced.
(5)Proposals under subsection (1) or (3) shall be accompanied by an explanatory memorandum summarising—
(a)in the case of proposals under subsection (1), the reasons which in the opinion of the local planning authority justify the alterations which they are proposing; and
(b)in the case of proposals under subsection (3), the reasons which in their opinion justify the repeal and replacement of the structure plan.
(6)The explanatory memorandum shall also state the relationship of the proposals to general proposals for the development and other use of land in neighbouring areas which may be expected to affect the area to which the proposals relate.
(7)The explanatory memorandum—
(a)shall also contain any information on which the proposals are based; and
(b)may contain such illustrative material as the local planning authority think appropriate.