The contributions payable under Part I of the Act on the basis of the Income Tax Schedule A or rating valuation cover war damage to immovable property only. Such a basis is inapplicable to a scheme which covers both movable and immovable property without differentiating between them. There is thus no existing valuation which could be used as a basis of contribution for such a scheme, and ad hoc valuation on a large scale would be impracticable in present conditions. It is accordingly proposed that the aggregate contributions of the members of each group of public utility undertakings should be 50 per cent. of the estimated aggregate war damage payments to the members of the group, and that the contributions should be payable in four annual instalments of which the first would be due on the 1st July, 1942 (such adjustments being made from time to time as may be necessary by reference too successive estimates of the aggregate payments). It is, however, proposed to provide that as soon as may be possible after the termination of the war the War Damage Commission shall, whether on their own initiative or at the instance of the parties, take into consideration the 50 per cent. rate and make a report whether, and if so to what extent, that rate should in their judgment be reduced as respects any or all groups of public utility undertakings, having regard to the relative amount of damage suffered and to all other relevant considerations.