12.—The Minister may—

(a) direct a local authority to serve a notice under section 11 (1), in relation to a derelict site which is included in the register, or

(b) direct a local authority to take such steps as he considers reasonable and necessary to give effect to the terms of a notice served under section 11 (1), or

(c) direct a local authority to take such steps as may be specified by him so as to prevent any land owned or occupied by them from becoming or continuing to be a derelict site,

and it shall be the duty of the local authority to comply with the direction within such period as may be specified by the Minister.