(1)  A person (the assistant ), including an interpreter, may accompany the inspector entering a workplace under section 163 to assist the inspector if the inspector considers the assistance is necessary.

(2)  The assistant –

(a) may do the things at the place and in the manner that the inspector reasonably requires to assist the inspector to exercise compliance powers; but

(b) must not do anything that the inspector does not have power to do, except as permitted under a search warrant.

(3)  Anything done lawfully by the assistant is taken for all purposes to have been done by the inspector.