Thanks for your comments Haribosmummy and Campion.
DD is actually very bright and doing well in primary, always in top 5 in the class. We have discussed the chances/possibility of her going through to the private sector, BUT DH is against it. He thinks that the 'rarefied' environment of private schools give great academic results but not always the most balanced view of life. Also, she'd be the little poor kid in the little rich kids world...I struggled with that even in my sink estate comp. I got top streamed with the private house owning kids (pretty much exclusively) and got bullied for that, so it's not something I'd like to replicate.
Bullying does come in at all kinds of schools. You get kids in a group, you get some element of gang mentality, be it the preppy ones who hate the townies or the townies who hate the preppies. I think you'd have to be pretty naieve to think paying for an education guarantees you a smooth pathway for your child emotionally, educationally or in any other way. Kids will be challenged in different way in each environment.
We're hoping that dd's sensible head (she's 8, going on 45 most of the time) will keep her away from the majority of trouble during secondary school. She's a self starter, competitive and generally interested in education, so hopefully that'll carry her through the comp without undue difficulties.
In an ideal world state education would give us everything we want for our girl, but that ideal world doesn't exist. We are at the stage where we've balanced out her needs for academic success vs her need for social integration and have decided that the latter is probably much more important. For that reason alone, I'll happily back up my husband's desire and let dd follow the path through comp to university and then into the big wide world.
She may not get the best grades, the best university place in the world, but with the right support and encouragement I'm hopeful that she'll do well in life. And if there's one thing I've learned, having managed graduates from all kinds of different backgrounds, it's that a great education isn't the be-all and end-all you might think.