Service of documents, etc.
56.—(1)  Any notice, order or document required or authorised by this Act to be served on any person, and any summons issued by a court against any person in connection with any offence under this Act may be served on the person —
(a)by delivering it to the person or to some adult member or employee of his family or household at his last known place of residence;
(b)by leaving it at his usual or last known place of residence or business in an envelope addressed to the person;
(c)by sending it by registered post addressed to the person at his usual or last known place of residence or business; or
(d)in the case of an incorporated company, a partnership or a body of persons —
(i)by delivering it to the secretary or other like officer of the company, partnership or body of persons at its registered office or principal place of business; or
(ii)by sending it by registered post addressed to the company, partnership or body of persons at its registered office or principal place of business.
(2)  Any notice, order, document or summons sent by registered post to any person in accordance with subsection (1) shall be deemed to be duly served on the person at the time when the notice, order, document or summons, as the case may be, would in the ordinary course of post be delivered and in proving service of the notice, order, document or summons it shall be sufficient to prove that the envelope containing the same was properly addressed, stamped and posted by registered post.
(3)  Any notice, order or document required or authorised by this Act to be served on the owner or occupier of any premises, vessel or aircraft or any summons issued by a court against any such owner or occupier in connection with any offence under this Act may be served —
(a)by delivering it or a true copy thereof to some adult person on the premises, vessel or aircraft; or
(b)if there is no such person on the premises, vessel or aircraft to whom it can with reasonable diligence be delivered, by affixing the notice, order, document or summons to some conspicuous part of the premises, vessel or aircraft.
(4)  Any notice, order or document required or authorised by this Act to be served on the owner or occupier of any premises, vessel or aircraft or any summons issued by a court against any such owner or occupier in connection with any offence under this Act shall be deemed to be properly addressed if addressed by the description of the owner or occupier of the premises, vessel or aircraft without further name or description.