scallies gonna scally. it's a tough one because I would love the book thrown at him, but given the police won't even come out and visit criminal damage usually (in my case we knew who did it , the police admitted they knew who did it and they left textbook fingerprints on my car )
to be honest this is the totally predictable other shoe falling of teenagers under 18 knowing they can do almost what they want with no consequences wrt vandalism.
personally I would give him at least 100 hrs community service and do the same for all petty vandalism. short term it may cost some money but long term I think it would pay for itself as it would be a proper deterrent.
I came across a Range Rover which had been stripped of parts and rolled down a car park into a tree one night, not that there was much they could do but the police clearly didn't give a ****, which just encourages these types to think they can get away with it.