Ah thanks, really appreciate you taking the time to reply.
I think what you say makes absolute sense. I am reconciled to the idea of some tutoring and don't really have a problem with it since he generally has a lovely life with a 3 minute walk to school. I'd be wary of doing it if he were at a school with a long journey or one that was already academic to begin with.
I think at the moment he wouldn't shine at an interview since he always looks away from adults asking him something. But it's a long way off and I think that having lots of meals together is probably the best prep for this.
And I'll look into those schools you suggest. Lots of people my way go to Forest too.
Be warned the Head at Mill Hill is planning on taking the school up in to the realms of high academia and rivaling other more challenging schools - his words.