I've seen a documentary on this sort of thing!
What you do is simple, you buy an old knackered scooter which he and his buddies all take the **** out of, you do it up over time and make it a real mean-machine scooter which impresses the girl you both secretly have a thing for, then one day in front of all his mates you challenge him to a game of chicken on your scooters, at the last minute he bottles it and swerves off into a lake and looks a complete buffoon! The girl runs to you and you become a hero to all his friends who know now what a complete loser he is! He then realises how foolish he's been and you all then become great friends and have amazing and hilarious adventures together which are shown in the documentary sequel.
Hidden camcorder or stick your smartphone above your top pocket and video it.
Make sure you say nothing out of order but get several incidents and at least you'll have some evidence.
Make sure you post it to Facebook asking 'Does anybody know who this is?' (don't be offensive) and within minutes it will be shared with Family & Friends who know him.

I would 100% go with the camera, as soon as they know you have proof and can show people kids poo themselves.
People are saying the police will side against OP. Not really...
Hence why I said report it to them first. Warn him. Report it to them again that you're feeling threatened. You are allowed to defend yourself using reasonable force. Don't kick seven bells out of him but one good smack next time he comes at you or starts getting mouthy.
He's 15? Old enough for a smack tbh.


Thanks for the replies everyone, they haven't gone unnoticed.
I am not risking laying a finger on him, for obvious reasons.
I will however always be prepared to film any further incidents, what are my rights to filming people in pubic? As far as I'm aware I'm allowed to do it.
Thanks for the replies everyone, they haven't gone unnoticed.
I am not risking laying a finger on him, for obvious reasons.
I will however always be prepared to film any further incidents, what are my rights to filming people in pubic? As far as I'm aware I'm allowed to do it.
Filming him will do nothing other than antagonize him further and make the situation far worse!
Just ignore him, it's not rocket science!!