5. Where any person is authorised by a licence of the Secretary of State issued under this regulation and for the time being in force to produce, supply, offer to supply or have in his possession any controlled drug, it shall not by virtue of section 4(1) or 5(1) of the Act be unlawful for that person to produce, supply, offer to supply or have in his possession that drug in accordance with the terms of the licence and in compliance with any conditions attached to the licence.