s 12 Revocation of authorisation.
(1) The enforcing authority may at any time revoke an authorisation by notice in writing to the person holding the authorisation. (2) Without prejudice to the generality of subsection (1) above, the enforcing authority may revoke an authorisation where it has reason to believe that a prescribed process for which the authorisation is in force has not been carried on or not for a period of twelve months. (3) The revocation of an authorisation under this section shall have effect from the date specified in the notice; and the period between the date on which the notice is served and the date so specified shall not be less than twenty-eight days. (4) The enforcing authority may, before the date on which the revocation of an authorisation takes effect, withdraw the notice or vary the date specified in it. (5) The Secretary of State may, if he thinks fit in relation to an authorisation, give to the enforcing authority directions as to whether the authority should revoke the authorisation under this section.