Within 14 days of the incident, the MIB expects you to have reported the incident to the police. The police must investigate hit-and-run incidents whilst also trying to trace the third party. you must have a good reason to not report an incident to the police within the 14-day time frame and you may be unable to claim if you have not. The MIB understand that the police cannot always investigate these matters and they do not need a full police report but MIB needs evidence it has at least reported the matter.
The MIB would also expect you to report the incident to your insurer. If you are aware of any CCTV, dash cam footage or witnesses, the MIB would expect you to tell the police and your insurers so they may attempt to retrieve it.