Selling at a car auction is straightforward. The car goes into a suitable sale (the auctioneers will advise you). If it sells, you receive a cheque for the sale price minus commission and entry fees.

If you don't set a reserve price and there's little interest, your car could make very little. If you set the reserve too high, the car may not sell; you've wasted time and your entry fee. Even if it does sell for above your reserve (or if you accept a lower 'provisional' bid), you'll only get trade price.