Any instrument which has been made by a Minister before the appointed day may be amended by the appropriate Minister by the substitution of references to—

the whole or parts of one or more specified areas (as defined in regulation 44); or

one or more specified authorities (as so defined);

and thereafter the instrument shall have effect, or be proceeded with, accordingly.

In this regulation, “the appropriate Minister”, in relation to any instrument, means the Minister in charge of any government department concerned with the subject matter of the instrument, but the validity of any action shall not be affected by any question as to whether or not any Minister was the appropriate Minister for the purposes.