here's a better graph:
http://www.statistics.gov.uk/pdfdir/taxbhi0709.pdf
page 2
Original income and final income by income quintile group, 2007/08
taht graph shows total household income after redistributions as a result of direct and indirect taxtion and benefits and tax credits etc.
However (and here, ransos I shall apologise as I was too quick to criticise your point) in terms of JUST taxtion (i.e. excluding the effects of tax credits and benefits) then the proportionate tax rate is NOT very redistributive OVERALL
HERE is a disturbing fact you won’t have read anywhere else: the poorest families in Britain today pay a greater proportion of their income in tax than the wealthiest. Such a claim may sound crazy but here are the figures: the bottom fifth of earners pay 38.7 of their gross income in total tax, the next fifth 32.7 per cent, then 34.6 per cent, 35.4 per cent, falling to 34.9 per cent for the top fifth of higher-earning households. For those of you about to email in disbelief – after all, we have just had 12 years of Labour government – feel free to check out my sources. All these explosive figures are contained in The Effects of Taxes and Benefits on Household Income, 2007/08, a 38-page report by Andrew Barnard, published online yesterday by the Office for National Statistics.
SOurce: http://www.cityam.com/news-and-analysis/Allister-Heath/v3wex9416u.html
but, it is the indirect taxation which we've already agreed is regressive that's causing the most problems, and this mainly stems from the costs of fuel duty, ostensibly for environmental reasons, which is difficult for the left to have worked around yet.
… [the] anti-poor bias is entirely due to indirect taxation – value added tax and duties on alcohol and tobacco [and fuel duty] – which hit those on lower incomes much more severely. The bottom fifth pay 27.9 per cent of their gross income in indirect tax, the next fifth 18.6 per cent, then 15.9 per cent, 13.7 per cent and just 10.0 per cent for the top fifth.