A personal contract purchase UK (PCP) allows you to purchase the vehicle at the end of the lease. However, most people just give the car back and pick out another new one. After all, you really don't know how a car is going to fit you until you drive it after a while. Not enough leg room, gas hog, etc. are a few reasons you might not like the car. Leasing a car allows you to trade in for the best vehicle to suite you and your family.