Mr Clegg is right to be concerned about the possible effects of the scheme — but even more so to emphasise the need to build more. London house prices are now rising at six per cent a year, far ahead of salaries, putting home ownership out of reach of more and more Londoners: figures released earlier this year show that for the first time in decades, the number of renters overtook homeowners in the capital. The only solution, especially in view of foreign demand, is to build more.