user1467099964 it sounds like you are wanting to fight this but you also mentioned moving ds.
I wonder what would be better for him?
The thing that worries me if he stays is his boy will either seriously injure him, and what will the school do then, continue to turn a blind eye until you sue them? And that this appalling behaviour will damage his self esteem.
However, if you move him you have outlined two or three options, is that right? That he will go to a school that is not as academically good and will perhaps damage his academic and work experiences.
Or you may pay for him to go to a private school which may be financially very difficult for you, or less difficult but maybe less academically good.
Is that correct?
The issue with all these options is that your son may be bullied in another school, and that he may not make friends or such good friends as he has made here.
I think before you made a final decision I would approach an anti bullying charity and get advice.
I think you really need to kick upa stink with school. How long, in their own guidelines, does it say that it should normally take them to answer emails and correspondence. It may say on the website or you may need to call the office and ask. If they say they do not know, ask them to find out.
When they find out say what do you do when a message is IGNORED for days, or weeks?
I would personally print out all your emails and send them recorded delivery to the school and ask for a meeting with the head and/or head of year.
I would also speak to your local MP and look into what, if anything, Ofsted can do.
Document every single cut and bruise and consider sending photos.
Lastly, I hate the idea that it is wrong for kids to fight back. It is only wrong if this puts them in greater danger or the force is dsipraportionare and the other child is seriously injured - IMHO.
Other than that I would say it is not fighting back it is called in English self defense. I would look at the law and see what the law says about self defense. Primarily the best defence is to run away, and I would always do this and advise others to do it. But if cornered I would defend myself with anything I could find.
I am not advising you to tell your son to do this, I have no idea if it could get him into trouble or if he could be one of those poor unfortunate people who seriously injures someone while defending themselves.
But in your shoes I would want to get in writing or on tape what your son should do on the school premises if being attached by this child.
Please take all my advice with a pinch of salt! I am angry person, I am hugely anti bullying (despite not really being bullied myself at school or at work ever!)
If the school cannot keep your son safe then the head and staff involved should really be looking for another job, or speaking to their union about better training/legislation etc.
Have you seen the Bullying UK website?
www.bullying.co.uk/bullying-at-school/moving-school-if-you-are-being-bullied/