Yes, there is something called Auction Tamer, which I heard about 'elsewhere'. I might have a look at that, or see what alternatives there are.
I think I'll probably try Rodders suggestion and sit on the PC at the last minute.
3 more questions:
1. If the bidding doesn't reach anywhere near the sellers expectations, and he hasn't set a reserve, can he refuse to sell the item after the bidding has finished?
2. If I am still the highest bidder at the last seconds, is it worth 'sniping myself', by an extra quid, just to make sure someone else doesn't do the same?
3. I have heard some people say they would not trade with someone with no previous feedback reports. Is that common practise, and if so, how does a new trader get off the ground?