(1)  The cancellation, suspension or variation of an administrative determination, approval (except an oral approval given under regulation 144 ) or licence by a Competent Authority takes effect on –

(a) the day when the person to whom the determination applies or the approval was given, or the licensee, is given written notice by the Authority of the cancellation, suspension or variation and of the reasons for the cancellation, suspension or variation; or

(b) a later day stated in the notice.

(2)  The cancellation or variation of an oral approval given under regulation 144 by a Competent Authority takes effect on –

(a) the day when the person to whom the approval was given is informed orally, or given written notice, by the Authority of the cancellation or variation and of the reasons for the cancellation or variation; or

(b) a later day of which the person is informed orally or in the notice.