for a start the vehicle driven by the other party, maybe regsitered in a "false name " .... the police unless TRAFFIC DIVISION get involved, will only use a minimal amount of "resources"/time,,,, to enquire about the ownership...... - maybe your insurance company could , see through the insurance database - whether the vehicle belonging to the other party , is ON the ini=surance DATABASE , if it is - then the driver of that vehile , maybe the policyholder and effectively insured , so his insurers , may or may not liase with your insurers...its a lot of "if , buts , or maybe " here , the DVLA are not obliged to tell you as a private enquirer , who the other vehicle is insured to , - did the UNKNOWN MOTORIST , drive into the back of you..... i mean is it "straight foward liability" .... the accident details , were not outlined , on this Q...... dont expect a great deal of assistance from thee POlice - in future accidents , asap report it it person to closest Police station, even if no one is injured as a citizen , the POLICE should not fob you of ..by saying " report it only with the insurers "..... at time of accident "tell aany other party involved in accident" YOU INTEND TO REPORT IT TO THE POLICE ...and see what there reaction is ......... regards