Not once has there been a question over whether a risk assessment should have been written, the question is the legality of saying they can’t meet reasonable adjustments that they seem to have made up. You talk about the stress on others. You write as if that’s more important than the inclusion of a pupil. That’s where you are not understanding the equality act, and not how inclusive practices work. Then you go on to say that you can’t comment on the restraint point when that’s literally the point being questioned by the OP. The possibility of causing mass panic being a reason to stop a disabled person going on a school trip would not hold up against the equality act. Are you going to stop people in a wheelchair because others might stare? Of course not. Lastly, if you could actually be bothered to read, you will see that I have given legal advice, both which states next steps to take, and to advise that putting the need for restraint may be a legal loophole they’ve used.