# Communications Act 2003, Paragraph 91


(1) A notice given under this code must not be sent by post unless it is sent by a registered post service or by recorded delivery.
(2) For the purposes, in the case of a notice under this code, of section 394 of this Act (service of notifications and other documents) and section 7 of the Interpretation Act 1978 (references to service by post), the proper address of a person (“P”) is—
(a) if P has given the person giving the notice an address for service under this code, that address, and
(b) otherwise, the address given by section 394.
(3) Sub-paragraph (4) applies if it is not practicable, for the purposes of giving a notice under this code, to find out after reasonable enquiries the name and address of a person who is the occupier of land for the purposes of this code.
(4) A notice may be given under this code to the occupier —
(a) by addressing it to a person by the description of “occupier” of the land (and describing the land), and
(b) by delivering it to a person who is on the land or, if there is no person on the land to whom it can be delivered, by affixing it, or a copy of it, to a conspicuous object on the land.
(5) Sub-paragraph (6) applies if it is not practicable, for the purposes of giving a notice under this code, to find out after reasonable enquiries the name and address of the owner of an interest in land.
(6) A notice may be given under this code to the owner—
(a) by addressing it to a person by the description of “owner” of the interest (and describing the interest and the land), and
(b) by delivering it to a person who is on the land or, if there is no person on the land to whom it can be delivered, by affixing it, or a copy of it, to a conspicuous object on the land.

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Source: https://www.legislation.gov.uk/ukpga/2003/21/schedule/3A/paragraph/91 (the official version)
Page: https://openlegislation.uk/communications-act-2003/schedule-3A/paragraph-91
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.