There are 2 common scenarios when a driver's identity must be supplied:
Firstly, following an accident if injury is caused to another person or damage, however slight, to another party's property. In such circumstances, the driver must supply his name and address and the details of the owner of the vehicle, if different.
The most common requirement is upon receipt of a Notice of Intended Prosecution. Details of the driver of a vehicle must be supplied when requested by the Police pursuant to Section 172 of the Road Traffic Act 1988. The registered keeper of a vehicle will receive a Notice of Intended Prosecution when the driver was not formally warned of potential prosecution at the time of the allegation. Typically, this will be for any offence supported by photographic evidence, such as speed camera/traffic signal contraventions.