12.—(1) In assessing the compensation payable to any person in respect of the acquisition from that person under this Order of any land (including the subsoil) the tribunal must 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 that person by reason of the construction of the development.
(2) In assessing the compensation payable to any person in respect of the acquisition from that person of any new rights over land (including the subsoil), under article 8 (power to acquire new rights), the tribunal must set off against the value of the rights so acquired—
(a)any increase in value of the land over which the new rights are acquired; and
(b)any increase in the value of any contiguous or adjacent land belonging to that person in the same capacity,
which will accrue to that person by reason of the construction of the development.
(3) The 1961 Act has effect, subject to paragraphs (1) and (2), as if this Order were a local enactment for the purposes of that Act.