From the Met's website: "Road traffic collisions Section 170 of the Road Traffic Act 1988 requires drivers/ riders to report to a police officer or police station that they have been involved in an accident involving in any of the following; -any personal injury -damage only, where the other driver/ rider did not stop -damage only, where names and addresses were not exchanged with the other driver/ rider/ cyclist and any other owner of property damaged (even if the other driver stopped) Road traffic self report collision form - Form 207 This form has been provided to allow drivers/ riders/ cyclists to self-report such cases where police did not attend the scene. It is emphasised that the completed form must be handed in to a police station and date stamped accordingly. This must be done as soon as is practicable and in any event within 24 hours of the accident in order to assist any possible investigation and to comply with the law. Upon receipt of the form you will then be sent a letter acknowledging receipt and explaining what will happen next. Reporting a collision / accident involving damage only - Form 206 -Where names and addresses have been exchanged with the other driver / rider / cyclist and with any other owner of property damaged. Although the law has been complied within these cases, some insurance companies ask that a report is still made to police. If you wish to do so, the completed form 206 can be taken to a Metropolitan Police Service station and shown to the reception staff, who will update it with the station stamp, date and time of reporting. You will be given the form to retain and there will be no additional police report. Do not submit this form by post." The forms can be downloaded from the Met's website.