Hi, Ireland - I take it you're in the UK, and I can't say I know much about schools here. Still, I've worked with kids all my life, and they're the same world 'round.
I think it helps to encourage kids to solve conflicts in a positive manner. The first step is to have your child imagine he is the other person, and think about what that other person may be thinking. If he learns to understand and respect the other person's point of view, that's a good starting point for resolving conflicts peacefully.
In most bullying situations, the victim is partly responsible for making himself a victim, so it's a good idea to investigate what your child is doing to invite bullying.
Maybe the school has a counselor who can help you and your child work this through. Confrontation rarely helps - try to find peaceul means of resolution.
-Joe Offer-