I was bullied my whole school life, right from the 1st grade. I know how badly it can affect you, and I know despite what everyone says many schools just don't give a damn.
Have you thought about homeschooling or distance education? At the end of grade 7 I began it and its the best thing that ever happened to me. It may be a bit daunting at first but your parents seem reasonable, not the time to say 'bullying biulds character' or any of that. And as for the popular socialization myth (beleive me, its a myth) what sort of socialization are you getting at school? getting beaten up and bullied daily, not having any friends? Yeah thats a whole lot better than being alone. And homeschoolers are rarely alone, theres plenty of groups and most also join mainstream after-school activities, or have part time jobs. Even if both your parents work, you're old enough to work through the majority of the curriculum alone, and may just need to sit with one for an hour each night.
If you have any questions about homeschooling or would like some further infomation about it please feel free to PM me. I don't know much about the laws for it in the UK but I know Australia and America and I'm sure I could find out about the UK for you and what resources are out there.
theres a lot of links here you could look through with your parents. Good luck with that
As for the right now, at school, keep telling teachers. I had one teacher who finally got sick of me telling and actually did something! lol, it was a one off, but they can't do anything if you keep quiet. Prehaps also try telling a differant teacher, some are more sympathetic than others. And block these bullies out, don't give them the time of day, wether you fight back or walk away, don't let them see you upset. and for goodness sake make sure they never see any SI, beleive me on that one.
I really hope things get better for you and please feel free to PM me if you want to chat or anything. You can get through this and live a better life afterwards.