asked the Chancellor of the Exchequer what would be the revenue cost in 1977–78 terms of (a) raising the threshold for investment income surcharge to £4,000 and (b) raising the threshold for investment income surcharge to £4,000 and charging it at a rate of 10 per cent.

Assuming the implementation of the Budget proposals, the estimated additional cost for 1977–78 would be as follows: (a) £130 million, (b) £195 million.