s 6 Service of notices.
(1) Any notice or other document required or authorised to be served under this Act may be served on any person either by delivering it to him, or by leaving it at his proper address, or by post. (2) Any such document required or authorised to be served upon an incorporated company or body shall be duly served if it is served upon the secretary or clerk of the company or body. (3) For the purposes of this section and of section 7 of the Interpretation Act 1978 , the proper address of any person upon whom any such document as aforesaid is to be served shall, in the case of the secretary or clerk of any incorporated company or body be that of the registered or principal office of the company or body, and in any other case be the last known address of the person to be served. (4) If it is not practicable after reasonable enquiry to ascertain the name or address of an owner or occupier of land on whom any such document as aforesaid is to be served, the document may be served by addressing it to him by the description of “owner” or “occupier” of the premises (describing them) to which it relates, and by delivering it to some person on the premises or, if there is no person on the premises to whom it can be delivered, by affixing it, or a copy of it, to some conspicuous part of the premises.