Yes, one person can be the main driver of two cars. A lot of young people are having to do this to insure their cars and it is a bit of a vicious circle. Without building up your no claims bonus your insurance premiums are going to be high for a long time to come, and while the premiums are so high you can't build up your no claims bonus. I do sympathise. When I got my first car I insured it "third party, fire and theft" as opposed to fully comprehensive. This brought down the cost significantly. Have you looked at that option? It means if you crash the car and it's your fault then you have to pay for the damage to your own car. The insurance company will pay for the damage to any other car involved. I don't know how much the insurance will cost with someone else as main driver, this depends alot on their own driving history and bonus, convictions, etc. Good luck.