(1)If it appears to the Secretary of State that it is expedient that a stop notice should be served in respect of any land, he may himself serve such a notice under section 140.
(2)A stop notice served by the Secretary of State shall have the same effect as if it had been served by the planning authority.
(3)The Secretary of State shall not serve such a notice without consulting the planning authority.
(4)The provisions of this Act relating to stop notices apply, so far as relevant, to a stop notice served by the Secretary of State as they apply to a stop notice served by a planning authority, but with the substitution for any reference to the planning authority of a reference to the Secretary of State, and any other necessary modifications.