Thing is, if you paid £75 grand for your house 10 years ago, and you've been told it's supposedly worth £200k now due to the absurd boom of the last decade or whatever, well if you want it to sell I think people should perhaps 'get real' and ignore what it's supposedly worth, and accept that any sort of profit is good. If there's no profit - i.e. you just bought, then unlucky/silly you.
Something's only worth what somebody will pay for it, and it looks like nobody will pay what's being asked (finally!).
IMO, houses at the current prices are just not a valuable proposition whatsoever. They're just not worth what the market is asking, in terms of real value. It's like a loaf of bread costing £10. I'd just stop eating bread, 'cause it ain't worth a tenner a loaf!