R v Immigration Appeal Tribunal, ex parte Mehmet The power conferred on the Secretary of State by s 18(1)(a)a of the Immigration Act 1971 to make
regulations for written notice to be given to a person of an appealable decision taken in respect of him,
is discretionary and therefore entitles the Secretary of State to make regulations which expressly
dispense with the need to give written notice to a class of persons, namely persons whose addresses are
unknown.