The local planning authority may—
withdraw an enforcement notice issued by them; or
waive or relax any requirement of such a notice and, in particular, may extend any period specified in accordance with section 173(9).
The powers conferred by subsection (1) may be exercised whether or not the notice has taken effect.
The local planning authority shall, immediately after exercising the powers conferred by subsection (1), give notice of the exercise to every person who has been served with a copy of the enforcement notice or would, if the notice were re-issued, be served with a copy of it.
The withdrawal of an enforcement notice does not affect the power of the local planning authority to issue a further enforcement notice.