171.— (1) A notice under this Chapter may be served on a person by sending it by registered post in an envelope addressed to him or her at his or her usual or last known address.

(2) If for any reason the envelope cannot be so addressed, it may be served on the person for whom it is intended by—

(a) sending it by registered post in an envelope addressed to “the occupier” without stating his or her name, at the land to which the notice relates, or

(b) affixing a copy of the notice prominently on the land.