Administrative Arrangements Act 1990

Where –

in accordance with administrative arrangements effected by an administrative instrument, a function of a department becomes a function of another department; and immediately before the date on which those administrative arrangements took effect, a person (in this section referred to as "the delegate") was authorized to exercise powers and perform duties with respect to that function in pursuance of a delegation in writing –

the authority of the delegate to exercise those powers and perform those duties with respect to that function continues until the authority of the delegate to do so is terminated, by notice in writing delivered to the delegate, by the person by whom such a delegation may be given on or after that date.