If it appears to a council, having regard to the local 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 within its district, being consent granted on an application made under this Part, the council may, subject to subsection (2), by order revoke or modify the consent to such extent as (having regard to those matters) it considers expedient.

The power conferred by this section 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.