Looking for a new car, or flogging your old one? Autotrader has compiled a list of the fastest selling vehicles in the UK, and the winner might just surprise you. Whether you commute hours away from the office and need a reliable wagon , or want to show off with a fancy sports car - driving is a necessity for most Brits. Therefore, the car sales site has analysed the average number of days each car was listed on its platform before being removed - assuming this means a sale has gone through.