Other cases where a fire certificate becomes inadequate

8	If the Executive considers that a fire certificate should be varied or cancelled because any of the matters ,mentioned in Regulation 5(1)(d) to (g) and 5(2) is or has become inadequate it shall-
	(a)	inform any person to whom the certificate, or a copy of it, was given under Regulation 5(4) of that fact and the steps, if any, which would have to be taken for those matters to become inadequate;
	(b)	notify him that it will cancel the certificate unless those steps are taken within such time as may be specified in the notice; and if at the end of that time, or such further time as may be allowed by the Executive or by any order made on, or in any proceedings arising out of, an appeal under Regulation 12 against the notice, those steps have been taken, the Executive may vary the certificate accordingly and if they have not been taken may, subject to any such order, cancel it.