Wow. After reading the comments that appeared after my post above, I sure am glad my child is at DESS, which btw isn't an all-white British expat school. British passports are held by a range of races and religions and DESS reflects that diversity. My guess is that about 2/3 would be considered "white", which is about the same as at the American School and Doha College.

I don't know about Newton in this regard (and I don't think it matters), but my comments vs Sherborne are derived from recent and current parents in the primary schools. Sherborne has a reputation of better facilities and better morale amongst the staff. Newton has a reputation being dismissive of parents. And I can't say that Missteachers posts are doing much to dispel my generally negative impression of Newton.

That said (to the OP), there won't be a great deal of choice this late in the year. The best think is to secure a place and then shop around in the early autumn. It's not unusual for parents to start with one school and then upgrade when places become available.