Petrol And Derv Mr. Skeet asked the Chancellor of the Exchequer what is the estimated revenue from excise duty on motor spirit and derv, respectively, in 1977–78 and 1978–79. Mr. Robert Sheldon Estimates of the revenue from excise duties on road fuel are: ------------------------- | | | ------------------------- | | | ------------------------- |1977–78 (provisional)|…| ------------------------- |1978–79 (estimates) |…| -------------------------