Long story, but in summary:
I live in very good area in W Midlands, few houses and quite expensive.
Divorcing, remortgaging the house to fund the new home for the wife (hers is a bargain by the way in a nearby area).
Surveyor came to value mine for the remortgage, opening sentance - housing market's been falling quite sharply lately.
My house was given a value by the mortgage broker based on the alledged rises since I purchased the house.
Surveryor eventually submitted 7% below assumed value.
Truth is if I had to sell I'd have to come in a good deal cheaper than that.
The only saving grace for this valuation was that my house is totally unique to the area so they have nothing else to compare it to. Conversely the ex-missus is buying a house on a 24 yr old development, others are for sale, hers has been dropped to very low price cause the sellers have been let down twice and are desparate to sell so they can move to Portugal.
All of this matters little to me, I'll stay where I am indefinately, love the house and the area. I tried to advise the missus to rent and buy in 12months time if she wants to save some cash and grab a bargain; however what she does is her affair, and I think dont think she'll save too much more than she is already.
I think the market will drop 30% (the rough amount its overvalued), but it wont be a sudden drop, it will be a drop in real terms, i.e. people like me will have to knock off between 7 and 10% each each year to sell for the next 2 or 3 years, followed by stagnation. Meanwhile inflation will be relatively buoyant, meaning in real terms prices will overall drop around 30-40% over 10 years.

, double it to 60% .