17.—(1) In assessing the compensation payable to any person in respect of the acquisition from him under this Order of any land (including the subsoil or undersurface), the tribunal shall set off against the value of the land so acquired any increase in value of any contiguous or adjacent land belonging to that person in the same capacity which will accrue to him by reason of the construction of the authorised works.
(2) In assessing the compensation payable to any person in respect of the acquisition from him of any new rights over land (including the subsoil or undersurface) under article 11 above, the tribunal shall set-off against the value of the rights so acquired—
(a)any increase in the value of the land over which the new rights are required, and
(b)any increase in value of any contiguous or adjacent land belonging to that person in the same capacity,
which will accrue to him by reason of the construction of the authorised works.
(3) The Land Compensation Act 1961 shall have effect subject to paragraphs (1) and (2) above as if this Order were a local enactment for the purposes of that Act.