s 65 Power to revoke or modify planning permission.
(1) If it appears to the planning authority that it is expedient to revoke or modify any permission to develop land granted on an application made under this Part or section 242A , the authority may by order revoke or modify the permission to such extent as they consider expedient. (2) In exercising their functions under subsection (1) the authority shall have regard to the development plan and to any other material considerations. (3) The power conferred by this section may be exercised— (a) where the permission relates to the carrying out of building or other operations, at any time before those operations have been completed; (b) where the permission relates to a change of the use of any land, at any time before the change has taken place. (4) The revocation or modification of permission for the carrying out of building or other operations shall not affect so much of those operations as has previously been carried out. (5) Part II of Schedule 3 shall have effect for the purpose of making special provision with respect to the conditions which may be imposed by an order under this section revoking or modifying permission for development consisting of the winning and working of minerals or involving the depositing of refuse or waste materials.