PART II Compensation for Refusal, or Conditional Grant, of Planning Permission

25 General provisions as to amount of compensation
(1) Subject to the next following subsection, where a person is entitled to compensation under this Part of this Act in respect of the depreciation by a planning decision of the value of an interest in land to which the planning decision relates which at the time of that decision has an unexpended balance of established development value (in this section referred to as " qualified land "), the amount of the compensation shall be whichever is the less of the following amounts, that is to say—
(a) the amount by which the value of the interest, or, in the case of an interest extending to other land, the amount by which the value of the interest in so far as it subsists in qualified land, is depreciated by the decision; or
(b) the amount of the unexpended balance of established development value immediately before the decision of the qualified land in which the interest subsists:
Provided that if compensation is payable under this Part of this Act in respect of two or more interests in the same qualified land by reason of the same planning decision and the aggregate amount of compensation payable apart from this proviso in respect of those interests exceeds the amount mentioned in paragraph (b) of this subsection, the amount so mentioned shall be allocated between those interests in proportion to the depreciation of the value of each of them respectively, and the amount of the compensation payable in respect of any of those interests shall be the sum so allocated to that interest.
(2) Where the land to which the planning decision relates, taken as a whole, does not satisfy the following conditions, that is to say—
(a) that the land is qualified land; and
(b) that every interest subsisting therein the value of which is depreciated by the decision subsists in the whole thereof,
then, for the purposes of assessing the compensation payable under this Part of this Act in respect of any interest subsisting in that land or any part thereof—
(i) the depreciation of the value of the interest by the planning decision shall first be ascertained with reference to the whole of the land to which the planning decision relates and in which that interest subsists;
(ii) the land to which the planning decision relates and in which that interest subsists shall then be treated as divided into as many parts as may be requisite to ensure that each such part consists of land which either satisfies the conditions aforesaid or is not qualified land; and
(iii) the depreciation of the value of the interest ascertained as aforesaid shall then be apportioned between the said parts according to the nature of those parts and the effect of the planning decision in relation to each of them,
and the amount of the compensation shall be the aggregate of the amounts which would be payable by virtue of the preceding subsection if the planning decision had been made separately with respect to each such part.