No Ladymuck is right with the school concerned - there are two classes and around 5 boys in each.
I agree DHToo - we do all think that!
But to answer your question re brightness - it is based on the fact he is 3.3 and is starting to read (just basic words at the moment), can count to 40, has a wide vocabulary etc. and several other observations from nursery which I won't bore you with. BUT he is not at all ahead of average with writing imho so that could be more of a problem, especially given girls are normally better with this anyway. I don't really mind that unless it will be a blow to his confidence?
He is left handed and I guess this won't help. We were however quite satisfied with the head's responses about how they deal with individual differences.
And yes the emotional maturity is likely to be an issue - not in dealing with the teachers or concentrating/ sitting still as he is very good at that. It is more likely to be an issue in interacting with his peers as he is not super-sociable with other children (although that might change of course given he is 3 and a halfish.)
I honestly think I'm pretty balanced and realistic about what he is especially able at and what he isn't (e.g. so-called 'pre-writing')
And of course, he's only 3 so he may change in lots of ways.
So I guess in summary I'd say on that dimension I'm not that worried about him not managing amongst the girls. And actually thinking about it, I suspect he will like the fact that girls, especially older ones, are likely to be that bit calmer and more predictable as he really doesn't seem to like boisterousness (well apart from in his own mad hour most evenings!)
I'm more worried about the stress of the 7+. Dh's view is that doing the 7+ is all a good thing because then we can choose the next school etc. but I just want my little chap to be happy and not being tutored/ doing extra work after homework!
Hmmm I'm still not sure what to do but you are all helping!!!