The powers of the Council under section 4 (Use of farm) and section 5 (Ancillary powers of Council) of this Act may with the prior consent of the Secretary of State and with the agreement of the Hillingdon Council be exercised in respect of such lands and buildings adjacent to the farm and vested in the Council as the Council may by resolution determine and upon such determination the said lands and buildings shall for the purposes of those sections be part of the farm.