In the end, I needed to change for the issue to be resolved - which I did, and, along with moving to a new environment which helped reset a lot of my social interactions, that helped a lot. Obviously that's not some instant magic wand solution - I went through five long years of this experience, with various teachers and other adults trying to help me before things started clicking and I started being able to move on - but in my experience there aren't really many better solutions.
So, while I can't reiterate enough how unacceptable bullying is, and what a negative impact it had on those years of my life, I do agree with the previous poster: the ultimate solution to being bullied often lies in the hands of victim (n.b. not literally: I never found violence helped me), and trying to resolve the situation via visible external intervention may well have little impact. For me at least, a better social education would have made me much more prepared to deal with the issues that I faced.