(1) A council may amend a local policy adopted under this Part by means only of a local policy so adopted.
(2) An amending local policy may deal with the whole or part of the local policy amended.
(3) A council may at any time revoke a local policy adopted under this Part.
(4) A local policy (other than a local policy adopted since the last general election) is automatically revoked at the expiration of 12 months after the declaration of the poll for that election.