The compensations payable on any claim shall be assessed by reference to prices current on the first claim day.
In assessing depreciation due to the physical factors caused by the use of any public works, account shall be taken of the use of those works as it exists on the first claim day and of any intensification that may then be reasonably expected of the use of those works in the state in which they are on that date.
In assessing the extent of the depreciation there shall be taken into account the benefit of any relevant works—
and it shall be assumed that any relevant works which could be or could have been carried out, or in respect of which a grant could be or could have been paid, under any of the provisions mentioned in paragraph (a) above have been carried out but, in a case where the authority having functions under that provision have a discretion whether or not to carry out the works or pay the grant, only if they have undertaken to do so.
The value of the interest in respect of which the claim is made shall be assessed—
In assessing the value of the interest in respect of which the claim is made there shall be left out of account any part of that value which is attributable to—
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