Yeah, it's in their prospectus. However, I honestly don't think you can read too much into it. A girl from my school got accepted, I got rejected. So it's not like they reject all single sex private school English applicants - at the end of the day, my predicted grades/personal statement/application in general just wasn't good enough for them. I'm not saying it was nothing to do with the selection criteria, I just don't think I can blame it entirely on their bias considering there are people who get in despite this - and having met a lot of people at Edinburgh through various societies, and a lot of them coming from very similar backgrounds to me, they clearly don't reject everyone who doesn't tick any of those boxes.
I don't agree with their policy anyway, although I admire their efforts to widen participation in higher education, it's an important goal!