The Institute of Fiscal Studies.

If 1% of the population pays 30% of the monies raised in taxation - just HOW do the left propose to 'tax the rich' even further?

None of these people are on P.A.Y.E.
Under Labour, the top one per cent of earners in 1979 paid just 11 per cent of the nation's income tax - despite the highest rate of income tax being set at 83 per cent.
To All You Lefties: High taxation drives out investment. It is a fact - LEARN TO LIVE WITH IT!