9(1)If it appears to the local planning authority, having regard to the development plan and to any other material considerations, that it is expedient to revoke or modify listed building consent in respect of any works to a building, being consent granted on an application made under Part I of this Schedule, the authority, subject to the following provisions of this paragraph, may by order revoke or modify the consent to such extent as (having regard to these matters) they consider expedient.
(2)An order under this paragraph shall not take effect unless it is confirmed by the Minister; and the Minister may confirm any such order submitted to him either without modification or subject to such modifications as he considers expedient.
(3)Where a local planning authority submit an order to the Minister for confirmation under this paragraph, the authority shall serve notice on the owner and on the occupier of the building affected and on any other person who in their opinion will be affected by the order ; and if within such period as may be specified in that notice (not being less than twenty-eight days after the service thereof) any person on whom the notice is served so requires, the Minister, before confirming the order, shall afford to that person and to the local planning authority an opportunity of appearing before, and being heard by, a person appointed by the Minister for the purpose.
(4)The power conferred by this paragraph to revoke or modify listed building consent in respect of any works may be exercised at any time before those works have been completed, but the revocation or modification shall not affect so much of those works as has been previously carried out.