(1)At any time after the approval of a structure plan for their district a local planning authority may submit to the Secretary of State and shall, if so directed by the Secretary of State, submit to him within a period specified in the direction, proposals for such alterations to that plan as appear to them to be expedient or as the Secretary of State may direct, as the case may be, and any such proposals may relate to the whole or to part of that district.
(2)The local planning authority shall send with the proposals submitted by them under this section a report of the results of their review of the relevant matters under section 1 above together with any other information on which the proposals are based, and sections 3 and 4 above shall apply with any necessary modifications in relation to the proposals as they apply in relation to a structure plan.