I know someone very well who has a DS there, and one now in the Upper, and one starting the Prep next Sept. Maybe.
He has mixed feelings:
Basically, yes, the school seems to be a sight better than the state infant/juniors they were in, hence the move. You'd possibly expect that for £10k p.a.!
He says: The school has changed quite a bit since the first DC started. They thought they were buying into a single sex, highly academic environment. They now feel the first DC got in right at the tail end of that. Since then they have started admitting girls, which my friend feels is a tacit admission that a) times are tough and b) results are all (his opinion, not mine!). They had/have kept the girls and boys separate, or at least did, initially, but the second DC still there is in an increasingly integrated class. He expects to be fully integrated in the Upper, as does the youngest DC who will be in coed from Y3.
The second DC is of more 'average' academic ability. The parents were, at parents evenings, constantly being told they had to get him privately tutored as well to ensure his 'pass' at the Upper entrance exam. As you can imagine, they kind of wondered where their £10k was going! Anyway, the eldest DS took the Entrance exam and passed. Apparently, though, the entire year group passed. Again, my friend wonders whether this reflects a particularly clever year, very good prepping- or a need to keep fee-paying parents on board!
Now, apparently, they have dispensed with the Upper entrance exam- entry to the upper is automatic for Prep DCs. However, my friend says he and a few other parents were called in, one by one to be told that they were to understand that their DC would not have passed the Upper entrance exam. He wonders whether this is a preparation towards them not being able to 'complain' if and when their DCs don't do very well academically at O level. He is also irritated that, apparently, as yet, the Upper will continue to offer only International O levels, not GCSEs, despite admitting they are taking on less able DCs.
He says a couple of parents have looked at moving their DCs to more appropriate schools. He was looking at The Leys but it's apparently eye-wateringly expensive!
So make of all that what you will!
From my personal, biased perspective, I must admit I would have expected to see more- well, 'private school confidence' and poise in the DCs concerned but I haven't!