I saw someone do this to someone's car last week, I took a picture of the offending car as it drove off, left a note on the owners windscreen to contact me and just received a witness statement form from the police to fill in. This was on a public road so he's going to get done for sure. Was an old boy that couldn't get out of a parking space so he just shunted the other car 3 times before he drove off. The old git (80yr old a least) was oblivious to what he had done, shouldn't be on the road and hopefully won't be much longer.