Subject to subsection (3) and sections 35A and 35B, the local planning authority may by resolution adopt proposals for the alteration or replacement of a structure plan, either as originally prepared or as modified so as to take account of—
If it appears to the Secretary of State that the proposals are unsatisfactory he may, at any time before the local planning authority have adopted the proposals, direct the authority to modify the proposals in such respects as are indicated in the direction.
An authority to whom such a direction is given shall not adopt the proposals unless—
Subject to the following provisions of this Chapter and to section 287, proposals for the alteration or replacement of a structure plan shall become operative on the date on which they are adopted.