Where it appears to the local planning authority—
they may, if they consider it expedient to do so having regard to the effect of the works on the character of the building as one of special architectural or historic interest, issue a notice under this section (in this Act referred to as a "listed building enforcement notice").
A listed building enforcement notice shall specify the alleged contravention and require such steps as may be specified in the notice to be taken . . .—
A listed building enforcement notice—
and, where different periods apply to different steps, references in this Part to the period for compliance with a listed building enforcement notice, in relation to any step, are to the period within which the step is required to be taken.
A copy of a listed building enforcement notice shall be served, not later than 28 days after the date of its issue and not later than 28 days before the date specified in it as the date on which it is to take effect—
The local planning authority may—
and the powers conferred by this subsection may be exercised whether or not the notice has taken effect.
The local planning authority shall, immediately after exercising the powers conferred by subsection (5), give notice of the exercise to every person who has been served with a copy of the listed building enforcement notice or would, if the notice were re-issued, be served with a copy of it
Where a listed building enforcement notice imposes any such requirement as is mentioned in subsection (2)(b), listed building consent shall be deemed to be granted for any works of demolition, alteration or extension of the building executed as a result of compliance with the notice.