If he were interested in equity, Gordon Brown, the Chancellor of the Exchequer, would have raised the tax threshold far above £250,000. But, in fact, he has discovered an unexpected source of income for the Treasury. Inheritance tax in 1997 represented only 1.5% of all taxes raised, having fallen from about 20% in the early years of the century. But since 1997, inheritance tax payments have increased by more than 50% as the value of homes has soared. At the same time, the Treasury has been making a further mint out of stamp duty.