Any document required or authorised to be served on any person under this Act may be served—
For the purposes of this section and section 7 of the Interpretation Act 1978 (c. 30) (which relates to the service of documents by post) in its application to this section, the proper address of any person on whom a document is to be served shall be his last known address, except that—
For the purposes of subsection (2), the principal office of a company registered outside the United Kingdom, or of a partnership carrying on business outside the United Kingdom, is its principal office within the United Kingdom.
If a person to be served under this Act with any document by another has specified to that other an address within the United Kingdom other than his proper address (as determined under subsection (2)) as the one at which he, or someone on his behalf, will accept documents of the same description as that document, that address shall also be treated as his proper address for the purposes of this section and for the purposes of section 7 of the Interpretation Act 1978 in its application to this section.
Where a document is required or authorised to be served under this Act on a person in his capacity as the owner of an interest in, or occupier of, any land and his name or address cannot be ascertained after reasonable enquiry, the document may be served by addressing it to him by name or by the description of "owner" or "occupier", as the case may be, of the land and—
In this section, "secretary", in relation to a local authority within the meaning of the Local Government Act 1972 (c. 70), means the proper officer within the meaning of that Act.