Before exercising any power conferred by this Part, an enforcement officer must, if requested to do so, produce evidence that the officer is authorised to exercise that power.

An enforcement officer may exercise a power conferred by this Part only if the officer complies with the duty imposed by subsection (1).

If, at the time the request is made, the officer does not consider it practicable to produce the evidence referred to in subsection (1), that subsection does not apply until such time as the officer considers it practicable to comply with the request.

Nothing in this section applies to a person falling within paragraph (c) or (d) of section 235(1).

Before exercising any power conferred by this Part, an enforcement officer must, if requested to do so, give the information in subsection (3).

Before exercising any power conferred by this Part, any person assisting an enforcement officer by virtue of section 260 must, if requested to do so, give the information in paragraphs (b) and (c) of subsection (3).

A person may exercise a power conferred by this Part only if the person complies with the duty imposed by subsection (1) or the duty imposed by subsection (2) (as the case may be).

If, at the time the request is made, the person does not consider it practicable to give the information referred to in subsection (1) or the information referred to in subsection (2) (as the case may be), that subsection does not apply until such time as the person considers it practicable to comply with the request.