Prices for prime central London prices rose by 20% in the 12 months to the end of March 2010. Prices are now rising at their fastest rate since March 2008 with growth being led by the lower to mid end of the central London market, with 24% growth for the sub-£2.5m sector.

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http://www.knightfrank.co.uk/news/London-prices-boom-20-growth-in-12-months-0170.aspx