I witnessed a car hitting another parked car, and car-at-fault just drove way. I took the runaway drivers' plate number, and asked my wife to take a video to prove it was nearby of the scene of the accident.
I also stopped, met the driver of the damaged car, passed on my contact details and the video. The damage seemed to be only to the mirror. My additional advice to him was to contact the local council as they had a CCTV camera, and hopefully they can provide some footage.
Is there anything else to be done from my side? I also assume that the incident would be categorised as a minor one.