We sold a car to a friend, but we continued using it to get from A to B. Now my wife and I have separated, but she won’t return the car. What can my friend do to get it back?
As long as your friend has evidence that he is genuinely the owner of the vehicle he could consider involving the police over an alleged theft; this would probably encourage your wife to return the vehicle. Alternatively your friend could take your wife to court to force her to hand over the vehicle or to compensate him for its value. If you sold the car after you and your wife separated your wife will probably argue that you have disposed of a jointly-owned asset when you come to sort out your finances.