House prices higher than ever in London

It is still to early to buy cheap houses in London - houses are still over priced: House prices expected to fall a further 10% | Money | The Guardian: "Average asking prices of new London sellers dropped by 1.3% or £5,068 this month to £386,653. However, the five most expensive London boroughs including Islington and the City of Westminster are still showing average asking prices higher than a year ago, with increases in initial marketing price of between 5.6% and 13.6%."

But if builders can not sell the new houses - will they drop their property prices in the London house market? When?