(1)Notices required to be served by the acquiring authority on any person interested in or entitled to sell any of the land—
(a)shall be served personally, or left at his last usual place of abode, or
(b)if he is absent from the United Kingdom or cannot be found after diligent inquiry has been made, may be left with the occupier of the land or, if there is no occupier, shall be affixed upon some conspicuous part of the land.
(2)If any such person is a body corporate the notice shall be left at the principal office of the body corporate or, if no office can after diligent inquiry be found, shall be served on some principal member of the body corporate, and such notice shall also be left with the occupier of the land or, if there is no occupier, shall be affixed upon some conspicuous part of the land.
(3)Paragraph 19 of Schedule 1 to the Act of 1946 shall apply to the service of notices under section 11(1) of this Act and, notwithstanding anything in subsection (1) of this section, notices required to be served by the acquiring authority under any other provision of this Act may be served and addressed in the manner specified in that paragraph.
(4)A summons or notice, or writ or other legal proceeding, required to be served on the acquiring authority may be served by being left at, or sent by post addressed to, the principal office, or any of the principal offices, of the acquiring authority.