I doubt the guy who hit the back of Mr Totty's car could have been part of the scam. Mr T was driving off a slip road to join another main road and the trouble-maker was already on the main road. There's no way the two of them would have been able to time it as a joint effort. Mr T had a friend in the car with him and both of them thought the guy who hit our car was pretty shocked, too. You're right about the liability of the car behind though, but it's always good when the other person doesn't try anything on with the insurance company in order to avoid liability. Every little helps.
Mr Totty is still smiling about his new car, which he'll pick up some time next week, but he's less smug about all the DIY I've just added to the list... Mwahahaha!