25Where, in the case of a claim holding (in this paragraph referred to as " the parent holding "), compensation under Part V of the Act of 1954 became or becomes payable in respect of depreciation of the value of an interest in land by one or more planning decisions or orders, and any such decision or order did not extend to the whole of the area of the parent holding, then, both for the purposes of the foregoing provisions of this Part of this Schedule and for the purposes of Part VII of this Act—
(a)the parent holding shall be treated as having been divided immediately before the time of completion into as many separate claim holdings, with such areas, as may be necessary to ensure that, in the case of each holding, either any such decision or order extending to the area of that holding extended to the whole thereof or no such decision or order extended to the area of that holding;
(b)the value of each of the separate holdings respectively shall be taken to have been that fraction of the value of the parent holding which then attached to the part of the area of the parent holding constituting the area of the separate holding; and
(c)the portion of the amount of any such compensation which, by the authority determining that amount, was or is apportioned to the area of any of the separate claim holdings shall be taken to have been compensation payable under Part V of the Act of 1954 in respect of that claim holding.