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Not a huge amount. he smashed his headlight and the front of his bumper so the impact was to the front of his vehicle, and by bumper on the back passenger side was split and it had been pushed across the back of the car by the impact.
What concerns me most is that it wouldn't matter if I had been in the wrong lane approaching the roundabout (despite the fact that it's not marked AT the roundabout and I was following other cars who took the same route) I was in the correct lane as i left the roundabout and he suddenly veered right and decided to take the second exit instead of the first. Also he said he was heading towards the road where we exchanged details, in which case he would have been staying in the left hand lane to turn left again at the next roundabout. He didn't need to change lanes. And when he left he headed away from where he said he was going.
I know that it's a bit of he said she said at the moment, but my account of the incident has been constant, he's changed his story a couple of times and now will not confirm where he was going.
I'm really upset about the whole thing, I've been driving 17 years and never even had a bump. I wish I had phoned the police. :(
As for the eye thing, my mum damaged her eye a few years back and although her vision was ok in the other eye she still had to inform the DVLA. That's the only reason I mentioned it.