Glitterygook, your house seems now the subject of a discussion over on the HPC thread. Have a look. Someone is saying that the house seems correctly priced.
All I can say is, the summer was the summer. The market may have cooled off further since. All that matters is what you can sell your house for now. Maybe you will sell it in spring at your price, maybe prices will slide more in your area, who knows. I am an experienced trader in the financial markets, and the one thing I can assure about is that yesterday's price means nothing.
There is a risk that you end up what is called "chasing the market down". This happens when the vendor is always pricing slightly too high for the market to achieve a sale, then reacts to a market fall by slightly cutting the price, but just not enough again the achieve a sale. The property then sticks on the market for a long time and the vendor repeatedly cuts the price.
What you should do depends on your individual situation. If you want a quick sale, you could cut the price a good deal, maybe just below the £250k stamp duty threshold. You could make up for the cut price by making a low offer on your next property. If you are in no rush to sell, maybe hang on for your current price, maybe it will sell for that in Spring, but remember the danger of chasing the market down. Also remember that £250k produce £12.5k interest per year in a savings account, so selling now at £250k puts you in the same position as selling for £262.5k in a year's time.