As statistics are not available showing the numbers of houses at each of the different pre-War rentals, the figures relating to various groups of typical rentals are combined in equal proportions in computing the average permissible increases for London (45 per cent.), other towns in England and Wales (51 per cent.), and Scotland (57 per cent.). These three figures are then combined in proportions corresponding with relative population in order to obtain the average permissible increase (49 per cent.) and this figure is reduced to 47 per cent. by making allowance for those cases in which the full permissible increase has not been imposed.