Hmmm.  No response so far from Man in the Middle, and nobody else other than Honeybee has contributed either.       The difficulty you have is that if you get convicted of failing to identify the driver, you'll end up with 6 points on your licence and an MS90 conviction code.  Insurance companies HATE MS90 convictions because they have a tendency to wonder what on earth you could have done to make not naming the driver a viable option.  (All they will see is that you've been