1Where it is material to ascertain—
(a)for the purposes of section seven of the Electricity (Supply) Act, 1926, the cost of production of electricity by the owners of a selected station;
(b)for the purposes of any such agreement as is referred to in subsection (3) or subsection (4) of the said section seven, the amount of any payment to be made by the Central Electricity Board to the owners of a selected station, or to the Board by the owners of a selected station;
(c)for the purposes of section thirteen of the said Act, the cost which owners of a selected station would have incurred, if that Act had not been passed, in themselves generating the like quantity of electricity to that taken from the Board; or
(d)for the purposes of any such agreement as is mentioned in section one of the [25 & 26 Geo. 5. c. 3.] Electricity (Supply) Act, 1935, between the Central Electricity Board and any electricity undertakers, the amount payable in respect of the operation of any generating station in pursuance of the agreement,
no account shall be taken of any expenses incurred by the Board or any other electricity undertakers in taking measures which they are or could be required to take under any provision of this Act, or of any sums paid under Part I of this Schedule by electricity undertakers to the Electricity Commissioners.