asked the Chancellor of the Exchequer what would be the difference in revenue yield in a full year, compared with the proposals in the Budget Statement, of making the following changes in income tax: (a) increasing the personal allowances to £1,060, single and wife's earned income, £1,630, married, £570, additional relief for one parent families, £1,400, age, single and £1,980 age, married, (b) abolishing the 25 per cent. rate of tax on the first £750 of taxable income and taxing this at the basic rate instead, (c) extending the basic rate band of £6,750, (d) taxing the various slices of taxable income above £6,750 at the following rates: £6,750–£7,850 at 40 per cent., £7,850–£8,950 at 45 per cent., £8,950–£10,100 at 50 per cent., £10,100–£11,200 at 55 per cent., £11,200–£13,450 at 60 per cent., £13,450–£15,700 at 65 per cent., £15,700–£17,950 at 70 per cent., £17,950–£23,550 at 75 per cent. and over £23,550 at 83 per cent. and (e) reducing the threshold for the investment income surcharge for those aged 65 years or over to £2,250 and extending the 10 per cent. band to £550.

, pursuant to his reply [Official Report, 2nd May 1978; Vol. 949, c. 103–4], gave the following information:At 1978–79 income levels and after taking into account the proposals in the Budget Statement there would be an additional yield of about £900 million.