DS1 is taking his 11+ in a fortnight, so yes, if he passes I will be sending him to the local boys' grammar.
Tbh I struggle with this a bit as I agree with others that a good, comprehensive education should be available to all. And yet, this will not happen whilst parents of the most able choose to send their children to selective or independent schools because they will do better there (like I am doing!).
Previous posters have commented that, in Comprehensive schools, far more attention appears to be given to those who are least able, whilst the most able are left to their own devices. This was certainly the case for me almost 30 years ago. I went from being top of my primary class by miles to a year or so later getting very average results and spending most lessons laughing at the back of the class with my mates. I hid how able I was - I would never in a million years have put my hand up and answered a question in class as that was social suicide! If I'd been sent to a grammar school or similar, I think I would have thrived in the company of other kids who wanted to learn and weren't embarrassed by their abilities. I did do well in the end, after very mediocre GCSE results I went to a sixth form where taking pride in your work was encouraged, did very well and got into a good uni.
I could absolutely see my experience happening to DS1 in a year's time. Once he becomes one of 200 kids in his year group, he could just switch off and no one would notice unless he created trouble. So I am keeping my fingers crossed that he passes the 11+, whilst also feeling uncomfortable about it all. The fact that it is a single sex school worries me too - I am trying so hard to instill my feminist principles into DS, if he barely sees a female for the next seven years surely he will view women as some kind of alien species? Will have to think about how to counteract that.