19.—(1) Any person who fails to comply with any requirement of regulations 3 to 17 above shall be guilty of an offence.
(2) If any person—
(a)obstructs an authorised person in the exercise of a power conferred by regulation 18 above; or
(b)fails without reasonable excuse to give such an authorised person any assistance or information which that person may reasonably require for the purposes of the functions referred to in regulation 18 above,
that person shall be guilty of an offence.