20.—(1) A person is guilty of an offence if that person—
(a)intentionally obstructs an authorised person;
(b)without reasonable cause, fails to give to an authorised person any information or assistance or to provide any facilities that such person may reasonably require;
(c)knowingly or recklessly gives false or misleading information to an authorised person; or
(d)fails to produce a record or document when required to do so by an authorised person.
(2) Nothing in paragraph (1)(b) shall be construed as requiring any person to answer any question if to do so might incriminate him.