To the original poster. May i suggest you take up judo and also a bit of boxing that way you can mix it with these punks at any range.

If you dont fancy boxing try unarmed combatives. Preferably anything from fairburn or sykes lineage. once these fukcers have felt a pre emptive cradle strike followed by an osot gari onto hard concrete your troubles will be over.

You'll be in borstal but at least you wont have to face those bullies again