Hi, I had the same problem. A van hit me in croydon. I searched online and foundhttp://www.direct.gov.uk/en/Motoring/OwningAVehicle/AdviceOnKeepingYourVehicle/DG_4022067 for ?2.50 I got the name and address of the driver. My insurance company were really unhelpful. It took DVLA nearly 6 weeks to get back to me but I finally got his details. You need to send an estimate of damage and photos. Hope this helps