associated annual series for capital consumption in 1958 replacement prices is available for the period extending from 1950 to 1966 inclusive. The annual NIE figure for capital consumption is centred on the third quarter, scaled, and linked by linear segments to provide the quarterly series. The mean of the aggregate ratio (0.02742) of capital consumption to capital stock is taken as representative of a constant depreciation parameter, B. p, q: these price-series are implicit deflators for GNP and GDFCF. For example, q is the ratio of GDFCF, non-dwelling, in current prices to the corresponding value in 1958 prices. u: the sum of three series representing profits tax, income tax on corporate profits, and an adjustment factor which takes account of special contributions, the excess profits levy, and the post-war refunds of the excess profits tax. The first two series are based on standard rates for these taxes, as presented in the Annual Reports of HM Commissioners of Inland Revenue, whereas the final series is based on the proportion of payments to income. Corporation tax was not paid until after the end of the sample period. vi: capital allowances were based on official rates for three composite categories of investment expenditures and on the proportions of these categories in GDFCF. About three-quarters of all fixed assets were covered by investment allowances and initial allowances. Annual, or wear and tear, allowances are based on actual aggregate allowances. This rate will depend on current and earlier rates of initial allowances and on the stream of investment expenditures within the preceding period extending over the lives used for assets in tax provisions. No simple formula can be derived to represent this.