A similar thing happened to me back in 2009, young lad who had only had his licence for 7 months, in a toyota starlet totalled my mondeo when he tried to cut across the front of me, nearly taking the front wing and bonnet with him, then shot off up the road, i gave chase and cornered him in a bus stop.
At the time i didn't know it was an arrestable offence, (Thanks clive for that), or i would have called the local constabulary out.
We did the usual, exchanged names ect, and i said i would call him so we could exchange insurance details, well i tried and tried but his mobile was always switched off and had no answerphone, eventually after 3 or four days his father rang me, i tried to explain what i wanted, and i was passed onto his older brother, who was beligerant to say the least, it was only when i told him that it was an offence under the road traffic act for the driver not to give the insurance details and if i didn't get them i would have no other recourse but to report it to the police, that reluctantly the younger brother, (Driver), gave me the details.
The upshot of it was that a year later he took me to court saying it was my fault and not his, however at the time of the collision i had an ambulance following me, the driver witnessed the entire incident and went to court for me.
Needless to say the outcome was somewhat guaranteed in my favour, but it still caused havoc when i went to renew my insurance