Where in respect of any land the local planning authority have served an enforcement notice, they may at any time before the notice takes effect serve a further notice (in this Act referred to as a " stop notice ") referring to, and having annexed to it a copy of, the enforcement notice and prohibiting any person on whom the stop notice is served from carrying out or continuing any specified operations on the land, being operations either alleged in the enforcement notice to constitute a breach of planning control or so closely associated therewith as to constitute substantially the same operations.
The operations which may be the subject of a stop notice shall include the deposit of refuse or waste materials on land where that is a breach of planning control alleged in the enforcement notice.
A stop notice may be served by the local planning authority on any person who appears to them to have an interest in the land or to be concerned with the carrying out or continuance of any operations thereon.
A stop notice—
(a) shall specify the date (not being earlier than three nor later than fourteen days from the day on which the notice is first served on any person) when it is to take effect;
(b) in relation to any person served with it, shall have effect as from that date or the third day after the date of service on him, whichever is the later; and
(c) shall, without prejudice to subsection (7) of this section, cease to have effect when the enforcement notice takes effect or is withdrawn or quashed.
If while a stop notice has effect in relation to him a person carries out, or causes or permits to be carried out, any operations prohibited by the notice, he shall be guilty of an offence and liable on summary conviction to a fine not exceeding £400, or on conviction on indictment to a fine; and if the offence is continued after conviction he shall be guilty of a further offence and liable on summary conviction to a fine not exceeding £50 for each day on which the offence is continued, or on conviction on indictment to a fine.
A stop notice shall not be invalid by reason that the enforcement notice to which it relates was not served as required by section 87(4) of this Act if it is shown that the local planning authority took all such steps as were reasonably practicable to effect proper service.
The local planning authority may at any time withdraw a stop notice (without prejudice to their power to serve another) by serving notice to that effect on persons who were served with the stop notice; and the stop notice shall cease to have effect as from the date of service of the notice under this subsection.