If your mate turns up to the hearing in a suit, looks apologetic and generally goes cap in hand to the magistrate chappy, he'll get a £200 fine and 6 points on his license and know better in future.
As a tailer for this, I should perhaps mention that I actually drove without Insurance for the first two years I was driving. Due to a mixup I thought I was on my parents insurance (since you know my Dad was sorting it out, and told me I was) but it turned out there'd been some kind of mistake and I wasn't. Driving without insurance can be done as a good faith mistake. I suppose you could argue I should have checked but, seriously, would you have checked you were on your parents insurance if they said you were? Fortunately I was never involved in an accident or pulled by the Police so it never came up in anger.