The guys have basically cover it on the comments above Simon. There are some major costs incurred with setting up included in the thread above including the fact that at some point you will have to register for VAT. But even if you do manage to keep under that threshold , £500 cars are the cars we move through the auction for a reason! If there was some type of profit in them without customer comeback then we would all be doing it. Sorry, in my humble opinion you either 'do something right or don't do it at all'!