There is the children and young persons act, that is supposed to ensure that belittling by teachers doesn't happen. What the teacher is doing is strictly illegal and more to the point bloody disgraceful. You can contact the head of the school and put in a formal complaint, you can contact the chairperson of the governing body and complain. you can ask for a meeting with yourself, the teacher and a senior member of staff management team. You can go directly to the local authority, Head of education or more likely director of lifelong learning (fancier name)

The school and also the LEA must by law have a policy on bullying with must include methods of dealing with incidents, and the framework for complaints.It should have an incident log in which things like this should be logged and recorded over time. The school must by law have a behaviour policy and references to behaviour management strategies.

What ever you do, don't take the law into your own hands, because unfortunately you will be the looser hands down!!

You should be able to obtain factual information from other pupils in the room to substantiate your sons claims.

I don't think it is right for a teacher to leave a class (though it does happen) in a technology/science room as there should be risk assessments carried out that the teacher should be aware of. If he left whilst there was the possiblity of an accident that is case for internal discipline as well.

The sad truth is that most schools have little real knowledge of how to deal with bullying, how to councel victims and how to manage poor behaviour. I feel that many schools cannot cope, and turn a blind eye to much of what goes on.

Try these avenues first. I'll get back to you with some working strategies if that's any help.

Lastly there is the general teaching council of England and wales that can take disciplinary action against teachers-but this would be difficult.