Minimum £3,000 part exchange on any car If your current car is old and tired, maybe it’s just failed its MoT and you face a big bill, then suddenly it’s worth at least £3,000 when you trade it in against a new Citroen C4 Cactus. What could be better than getting rid of your old car by using it as a hefty deposit on a shiny new car from Wilmoths Citroen? And it’s not just any new car but the highly fashionable yet highly practical and multi award-winning C4 Cactus.