My comprehensive insurance says it will cover me for damage caused to third parties while I'm driving cars that are not owned or hired by me. This cover for driving other cars, therefore, doesn’t include damage to the car I'm driving. What should I do to insure that the car is covered while on a test drive? Conversely, if I want to sell my own car privately how can I make sure that my car is insured when taken on test drives by others? I assume just asking them if they're insured isn't sufficient since they will only have, at best, third party insurance.