Here's your evidence house prices are falling from the Royal Institute of Chartered surveyors...
http://www.rics.org/Property/Residen...007_130907.htm
Also you might have noticed the City has been hit very very hard by the current bank crisis/liquidity crunch (I have had the joy of sitting in the middle of it).... there will be big lay-offs by banks and limited bonuses that have supported the London housing market over the past 3-4 years.
I think WWW is right that we are probably at or slightly past the peak in pilot recruiting in this cycle