Sorry Avid-fan (are you formally known as badcompany? ) If he had an accident and hit another car i'll bet he would run off and leave the car, or even if he stays at the scene he's not insured.

Would you want someone to hit your car and knowing that if someone had "grassed" him up you wouldnt be in a position where an un-insured driver has smashed up your car and your not getting a penny back for it?

Do the right thing and report the lad