(1)A person commits an offence if—
(a)he assaults an enforcement officer, or an assistant of his, while he is exercising any of the powers conferred by section 89 or 90;
(b)he intentionally obstructs an enforcement officer, or an assistant of his, in the exercise of any of those powers; or
(c)he fails or refuses, without reasonable excuse, to comply with such a requirement as is mentioned in section 89(4)(e) or (f).
(2)Neither an enforcement officer nor an assistant of his is liable in civil or criminal proceedings for anything done in purported exercise of any of the powers conferred by section 89 or 90 if the court is satisfied that the act was done in good faith and that there were reasonable grounds for doing it.
(3)Nothing in sections 89 to 91 or this section affects the exercise of any powers exercisable apart from those sections.
(4)A reference in sections 89 to 91 or this section, in relation to an enforcement officer’s assistant, to the exercise of any of the powers mentioned in section 89(4) is a reference to the exercise by the assistant of any of those powers on behalf of the officer.