To ask the Chancellor of the Exchequer (1) if he will estimate the income which would have accrued to the Treasury in each year if income tax rates had remained unchanged after the 1979 general election; [14706](2) if he will estimate the additional income, which would have accrued to the Treasury in each year if the four top rates of income tax had not been abolished in March 1988. [14705]

Such an analysis could only be provided at disproportionate cost.