I'm currently at the Le Portel aire, reviewing the dashcam video captured today on our journey from Laon. In the video, you can see us travelling along a road which becomes two lanes wide in our direction, at which point an open top car (which has been behind me for some time, unable to overtake due to traffic and lane restrictions) finally overtakes. As he gets past us he throws a handful of rocks? marbles? in the air in our direction, which hit my screen and bonnet. He's then off at speed. As it turns out, I can't yet see any damage, but... I have the dreaded Hymer headlights which could cost nearly £2000 to fix and a tiny crack from this incident could be disastrous. This behaviour is unacceptable. I have not yet seen the video in large screen format (need my home computer for that) but I'm sure that I can identify the make, model (possibly year) and registration number. As it's an open top, I'm fairly sure we get a good look at the bald driver too. Questions: Anyone here have any knowledge of how to proceed with a complaint? Anyone here have any knowledge as to whether any such complaint will be taken seriously? As there's no evident damage, is the best I could hope for that the gendarmes "have a word in his shell-like"? What would you do?