Gully
Monkey in a seagull suit.
If you really want to get them caught set up a camera. It's the only way.
Failing that get the mans name, email, work, phone number - anything you can. We're a creative lot on here once given a brief!
Not sure how much a camera with a motion sensor would cost, though it is a good idea. You could tell him that damage has been done to your car and you are concerned for not only your property but also that of everyone else in the street, therefore you have been to the Police who are interested in the matter, they have lent you a camera for the car and are eager to pursue and catch the guilty party. If you do this from the angle of being in everyone's interest, without accusing him directly (stupid idea if he is a meat-head) you might find that things go quiet, chances are he sounds like the sort of bloke who would avoid unnecessary interest from the boys in blue!