(1)Subject to the provisions of this section, any notice or other document required or authorised to be served or given under this Act may be served or given either—
(a)by delivering it to the person on whom it is to be served or to whom it is to be given ; or
(b)by leaving it at the usual or last known place of abode of that person, or, in a case where an address for service has been given by that person, at that address ; or
(c)by sending it in a prepaid registered letter, or by the recorded delivery service, addressed to that person at his usual or last known place of abode, or, in a case where an address for service has been given by that person, at that address ; or
(d)in the case of an incorporated company or body, by delivering it to the secretary or clerk of the company or body at their registered or principal office, or sending it in a prepaid registered letter, or by the recorded delivery service, addressed to the secretary or clerk of the company or body at that office.
(2)Where the notice or document is required or authorised to be served on any person as having an interest in premises, and the name of that person cannot be ascertained after reasonable inquiry, or where the notice or document is required or authorised to be served on any person as an occupier of premises, the notice or document shall be taken to be duly served if—
(a)being addressed to him either by name or by the description of " the owner " or " the occupier ", as the case may be, of the premises (describing them) it is delivered or sent in the manner specified in subsection (1)(a), (b) or (c) of this section ; or
(b)being so addressed, and marked in such manner as may be prescribed by regulations under this Act for securing that it shall be plainly identifiable as a communication of importance, it is sent to the premises in a prepaid registered letter or by the recorded delivery service and is not returned to the authority sending it, or is delivered to some person on those premises, or is affixed conspicuously to some object on those premises.
(3)Where the notice or other document is required to be served on or given to all persons having interests in, or being occupiers of, premises comprised in any land, and it appears to the authority required or authorised to serve or give the notice or other document that any part of that land is unoccupied, the notice or document shall be taken to be duly served on all persons having interests in, and on any occupiers of, premises comprised in that part of the land (other than a person who has given to that authority an address for the service of the notice or document on him) if it is addressed to " the owners and any occupiers " of that part of the land (describing it) and is affixed conspicuously to some object on the land.