(1) At the date of issuing an enforcement order or at any time thereafter before the enforcement order becomes operative, the local planning authority may, subject to section fifty, serve upon any person upon whom the enforcement order was served an order prohibiting the continuation of such operations or use as may be specified in the order, being operations which are or use which is the subject of the enforcement order.
(2) A prohibition order—
(a) shall specify the date when, notwithstanding any appeal against the enforcement order, it shall become operative; and
(b) shall cease to be operative—
(i) upon its withdrawal by the local planning authority by notice served on all persons upon whom the prohibition order was served; or
(ii) when the enforcement order becomes operative or is set aside.