(1) Where, in the opinion of the Authority, it is necessary to do so for the purposes referred to in section 18F(1)(a), the Authority may appoint, in writing -

(a) any of its officers or employees, or

(b) consultants or advisers engaged under section 23 who, in the opinion of the Authority, have qualifications and experience suitable to satisfactorily exercise the powers conferred upon authorised officers by or under this Act,

to be authorised officers to exercise the powers conferred upon authorised officers by or under this Act.

(2) Every authorised officer appointed under this section shall be furnished with a warrant of appointment and shall, when exercising any power conferred on him or her by or under this Act, if requested by a person affected, produce the warrant of appointment or copy of it to that person together with a form of personal identification.

(3) A person's appointment under subsection (1) as an authorised officer shall cease upon -

(a) the revocation by the Authority of the appointment,