Where an interest in any land has (whether before or after the commencement of this Act) been compulsorily acquired by, or sold to, an authority possessing compulsory purchase powers (not being statutory undertakers or the National Coal Board), that authority, and any person deriving title from that authority under a disposition made by that authority on or at any time after the appointed day, shall not be entitled to compensation under this Part of this Act in respect of a planning decision made after the service of the notice to treat, or after the making of the contract of sale, as the case may be, by reason that the value of that interest, or of any interest created (whether immediately or derivatively) out of that interest, is depreciated by the decision.
Subsection (1) of this section shall apply to land which has at any time on or after the appointed day (whether before or after the commencement of this Act) been appropriated by a local authority for a purpose for which the authority could have been authorised to acquire the land compulsorily, as it applies to land in which an interest has been acquired as mentioned in that subsection, with the substitution, for the reference to the service of the notice to treat, of a reference to the appropriation.
A person shall not be entitled to compensation under this Part of this Act in respect of depreciation of the value of an interest in land by a planning decision if he is entitled to compensation by virtue of section 165 of this Act in respect of depreciation of the value of that interest by that decision.