For the purposes of the last two foregoing sections of this Act—
(a)where the War Damage Commission determine to make a payment under section fifteen of the War Damage Act, 1941, or determine to make no value payment in a case in which the appropriate payment would be a value payment but, owing to the value of the land as a vacant site, its value in the state in which it was immediately after the occurrence of the damage is no less than its value in the state in which it was immediately before the occurrence of the damage, the determination shall have effect as if it were a determination to make a value payment ;
(b)where, in the case of any such land as is mentioned in subsection (4) of section thirty-nine of the War Damage Act, 1941, the Commission determine to make a payment (other than a payment of cost of works) under paragraph (a) or paragraph (b) of that subsection, or determine to make no payment under either of those paragraphs, the determination shall have effect as if it were a determination to make a value payment;
(c)where, in the case of land in respect of which a payment of cost of works would be the appropriate payment, the Commission determine to make a value payment by virtue of section sixteen of the said Act (whether in addition to a payment of cost of works or not), the determination shall not be deemed to be a determination to make a value payment.