Legendary guitarist Eric Clapton is fuming over the British government's taxing of his drug rehabiltation charity Crossroads.

The LAYLA rocker has raised millions of dollars (pounds) for the charity, which rehabilitates drug addicts in Antigua, but feels cheated over the amount of tax he has paid to the UK government.

British newspaper the Daily Mail reports Clapton is upset with Chancellor Gordon Brown over his failure to fulfil a commitment to top up charitable donations by 20 per cent, under the Gift Aid system.

A friend says, "The Gift Aid money hasn't happened. A lot of people, not just Eric, are pretty fed up. Eric has donated millions and he feels aggrieved that the government has yet to match its words with deeds. Instead of putting in the money promised, people are dragging their feet and even asking questions about the charity."