This section applies if the local planning authority think—
that there has been a breach of planning control in relation to any land, and
that it is expedient that the activity (or any part of the activity) which amounts to the breach is stopped immediately.
The authority may issue a temporary stop notice.
The notice must be in writing and must—
specify the activity which the authority think amounts to the breach;
prohibit the carrying on of the activity (or of so much of the activity as is specified in the notice);
set out the authority's reasons for issuing the notice.
A temporary stop notice may be served on any of the following—
the person who the authority think is carrying on the activity;
a person who the authority think is an occupier of the land;
a person who the authority think has an interest in the land.
The authority must display on the land—
a copy of the notice;
a statement of the effect of the notice and of section 171G.
A temporary stop notice has effect from the time a copy of it is first displayed in pursuance of subsection (5).
A temporary stop notice ceases to have effect—
at the end of the relevant period starting on the day the copy notice is so displayed,
at the end of such shorter period starting on that day as is specified in the notice, or
if it is withdrawn by the local planning authority.
In subsection (7)(a), "relevant period" means—
in the case of a notice issued by a local planning authority in England, 56 days;
in the case of a notice issued by a local planning authority in Wales, 28 days.