65(1)
If it appears to a local planning authority that the amenity of any part of their area, or of any adjoining area, is seriously injured by the condition of any garden, vacant site or other open land in their area, then, subject to any directions given by the Secretary of State, the authority may serve on the owner and occupier of the land a notice requiring such steps for abating the injury as may be specified in the notice to be taken within such period as may be so specified.
65(2)
Subject to the provisions of Part V of this Act, a notice under this section shall take effect at the end of such period (not being less than twenty-eight days after the service thereof) as may be specified in the notice.