20. A person who—N.I.
(a)knowingly uses, or knowingly causes or permits the use of, any premises, vehicle, vessel or stall contrary to paragraph 6; or
(b)being the holder of a licence for a sex establishment, employs in the business of the establishment any person known to him to be disqualified from holding such a licence; or
(c)being the holder of a licence under this Schedule, without reasonable excuse knowingly contravenes, or without reasonable excuse knowingly permits the contravention of, a term, condition or restriction specified in the licence; or
(d)being the servant or agent of the holder of a licence under this Schedule, without reasonable excuse knowingly contravenes, or without reasonable excuse knowingly permits the contravention of, a term, condition or restriction specified in the licence,
shall be guilty of an offence.