6(1)The local authority concerned—
(a)may by notice in writing given to the specified person vary the conditions attached to a special authorisation under paragraph 5 above, either on the initiative of the authority or on an application in that behalf made to them by the specified person; and
(b)if so directed by the Secretary of State, shall so vary those conditions in accordance with the direction.
(2)The power conferred by sub-paragraph (1)(a) above shall be exercised only with the approval of the Secretary of State given either for the particular exercise of it in question or generally for cases of a class or description into which that exercise of it falls.
(3)If the local authority concerned fails to comply with a direction of the Secretary of State requiring them to vary the conditions attached to a special authorisation under paragraph 5 above, the Secretary of State may himself by notice in writing given to the specified person vary those conditions.