Oratory parent here!
I have two children there. On the whole it’s been good. For one of them the year group, not the school was the problem, but they’ve definitely got the best out of him academically as he finds it hard to concentrate (suspect ADHD traits etc).
Typicslly caters to the ‘middle ground’ academically, with value added etc, but the brighter and academic scholars are pushed and those capable do well.
its a small school so the pupils cannot hide! Teachers know the kids well.
Sport is strong and there’s something got everyone. There’s always something going on. Big sports are rugby, football, racquets (real tennis and grass tennis courts, badminton and squash, Padel courts being built), hockey, netball, rowing.
All pupils allocated a boarding house (even if day pupils) so have that feeling of identity. Flexi boarding very flexible and easy to arrange.
My two went to quite a posh prep, and although it was lovely and they loved it, it was a bit OTT, whereas OS is pretty down to earth.
Downsides - very long day. Kids are exhausted. The last head (who disappeared after only one year mysteriously) forced through a few changes such as getting rid of Saturday school. But they still play sport on Saturday, so if there is a match on (which you don’t find out for certain until the Thursday before if your child is playing) you have to make the journey in. Current head - so far so good (but was deputy head for a few years here before so we are all familiar with him).
Obviously the religious side of things either attracts or puts people off! I’m not religious, although I did go to catholic schools so it’s not an issue and the overriding message to the kids get is be kind, help those less fortunate than yourself, treat others as you wish to be treated which is no bad thing!