Subject to the provisions of subsections (1A) and (2) no person shall-
(b) sell, let, use, operate or apply any Group III hazardous substance unless a licence under section 4 (b) is in force in respect thereof, and otherwise than subject to the conditions prescribed or determined by the Director-general;
(c) install or keep installed any Group III hazardous substance on any premises unless a licence under section 4 (c) is in force in respect of such premises, and otherwise than subject to the conditions prescribed or determined by the Director-General.