Do you know the kids or where they live? If you don't I'd just leave it as if their insurance will cover it then you might as well leave it at that. I understand your predicament but if you can track the parents down just go tell them rather than getting the police or insurance involved or anything. Suppose you could tell the owners of the cars you saw it was kids as they might need that info for their insurance.
Hi and thanks everyone for the comments.
Yes It's the kids of the house opposite mine. They were throwing polished pot-plant / pavement stones from their rooftop balcony whilst the parents hosted a party.
Yep.. I did stupid shit as a kid, probably didn't damage anyones property in that way but I understand how silly 'dares' can get with a group of hyped up teens.
I have decided that I will approach the tenannts and tell them what I saw and that the moral responsibility lies with them to either fess up to the car yard next to us and/or brutally punish their kids (ok bit much but you get it) !
If I get a knock on the door from the Car Yard owners I will tell them what I saw.
Sounds fair I hope!
Cheers