This is the problem. Although his behaviour at home has been awful, it does seem to be under control for now, and things are good. When he does misbehave we have consequences and he understands the boundaries. Things are a lot better.
The really awful behaviour is now at school. Hence good behaviour at school = x amount of time on the Xbox.
I agree about summer vs winter. Once they do after school activities it's bloody dark, so not much opportunity to chuck them outdoors.
Thanks for your responses. Does it get easier? you can lie
It got easier once we put the rule about no xbox in the week into place. Bizarrely there was little resistance, it was almost like now it had gone the pressure of wanting to be on it all the time was also gone.
He'll be going to high school soon, won't he? I would have that that will concentrate his mind somewhat and he'll find the teachers much stricter too.