So there are the lowest bids, then there are the unique bids and then there is the lowest unique bid - and that is the one that wins. It takes skill to work out what you think that might be. You can only bid in whole numbers of pounds (£1.00, £2.00, £3.00 etc.), but usually there's not much point bidding £1.00, because too many others are likely to do so as well (although not always!)