In an accident you have to exchange details. First you have to stop of course. Report to the Old Bill, and make sure that they follow up. You can also search details of the car through the DVLA database - this will at least tell you it is taxed and MOT'd - if not..... [cartaxcheck.co.uk
] This one is a commercial one, slightly quicker than SVLA (which is good), you need to have the reg and the make. I usually do it for smoky exhausts because I am a zealot.
PS all - you should know all of this when you take your driving test. And remember it.
Insurance companies sell on your details. At least we don't live in America where ambulance chasing is many times greater.