You can close an auction for a number of reasons. For example, if something happened and the item was damaged before the end of the auction, you're allowed to close it since it would be unfair to allow the bidding to continue for a damaged item, so you can just say it's damaged. I don't remember how to do this, though. Check on the Ebay discussion boards. In my experience, the people on the
international trading board are the friendliest and most helpful. It doesn't really matter if you go to the US or the UK board (I gave the US one), since it's mainly the same people on both anyway. Good luck, but also remember that your item will likely only get bids in the last day, anyway.