Hopefully, you'll at least learn something at the parent/teacher conference (ie., whether or not they will do something more for your child). I'm sorry that they have been excluding you - I'm not too familiar with school laws in US or UK, but in the US, i think parents have a right to know how their child is being educated.

If not IQ testing, do you think your school would give an end-of-year test or other test so he can show his ability?