I would get the cops involved, he is your mate not the guy he hit, how many times has someone said its all OK we can fix this up when they have then screwed the other person, "people are bastards and not to be trusted" is a motto that alot of people abide by.
I would not get in a car with a unlicenced driver on the road, unless he was a good friend who could pay all medical costs involved in case he stuffed up and crashed, Lest say, of the top of my head, $1,000,000 if Im hurt bad or $10,000,000 if he kills me which will go to my family.
Unlicenced/Uninsured= f ucking idiot.