I went into the police station & spoke face to face, they were lovely, & really seemed shocked at some of the stuff that had happened already, & have given me a phone number to report the next incident.... they made me feel really glad that I went in, so I would recommend going in person
someone passed me this link, which might also be of use to you, though on speaking with them, they said that the Schools have to reach a balance between the rights of the bullies, & the Rights of the victim........I can't deny DDs School do seem to be trying that, but still failing to keep her safe, as in her case its not straight forward bullying, & the Child in question is completely out of control & violent full stop
in your case, sounds like the School are not doing much to protect your Son at all, more protecting their reputation by pretending there is no problem....., & like has already been said, the School does have a "duty of care" to protect your DS too, so you can use this as your argument.......as the other Mums have had no joy with the authorities, I would also consider a complaint to ofsted, & even get the press involved, especially as others have left the School & can back you.
I don't envy you, & know how you feel, the stress of seeing my DD so ill because of her situation, is making me ill too, & that is with the School trying hard, I dread to think how feeling so let down & getting nowhere still as in your situation
another avenue I was told of, is if your DS health is at stake & you can get medical backing, then the LEA have to provide a private tutor........as its all about finances these days...perhaps the expense of that threat, might make them finally get there acts together
wont let me post the link here with out wiping my whole reply,[cofused] will post below & try & try & find the tutor info too....hopefully its relevent where you are too....good luck.........mad world we live in these days isn't it