19Appointment of inspectors
(1)Every enforcing authority may appoint as inspectors (under whatever title it may from time to time determine) such persons having suitable qualifications as it thinks necessary for carrying into effect the relevant statutory provisions within its field of responsibility, and may terminate any appointment made under this section.
(2)Every appointment of a person as an inspector under this section shall be made by an instrument in writing specifying which of the powers conferred on inspectors by the relevant statutory provisions are to be exercisable by the person appointed; and an inspector shall in right of his appointment under this section—
(a)be entitled to exercise only such of those powers as are so specified ; and
(b)be entitled to exercise the powers so specified only within the field of responsibility of the authority which appointed him.
(3)So much of an inspector's instrument of appointment as specifies the powers which he is entitled to exercise may be varied by the enforcing authority which appointed him.
(4)An inspector shall, if so required when exercising or seeking to exercise any power conferred on him by any of the relevant statutory provisions, produce his instrument of appointment or a duly authenticated copy thereof.