This is the kind of annoying thing my father always says to me, but if you sell your house for 1£, you'll have loads of offers.
We sold our house for about $30,000 less than we thought it was worth, but we sold it in 4 weeks. We watched the house next door take 1 year to sell and watched them lower their price $70,000. They ended up having to do a short sale, and had two mortgages for an entire year. We may not have made that $30,000, but we got it sold and are now unencumbered by it so that we can move to England.
Selling a house was totally nerve wracking so I hope yours sells soon.
Good luck!
-Brian
PS> I have NO knowledge of UK mortgages. Vicky posted while I was typing and she's probably right that price isn't everything. Got have the right buyers.