Q533: Can my car be driven by my friend if he has a fully comprehensive policy that allows him to drive other cars if my car is not insured at all?
If you are the registered keeper of a vehicle you must make sure your car is insured or you must make a Statutory off Road Notification (SORN). This means that if your friend is using your vehicle then it can't have a SORN and would therefore have to be taxed and insured. Additionally, any driver would also need valid insurance cover for their use of the vehicle.