We have a son in year 1 at Eaton House and have been very impressed with the school. The teachers are brilliant, and while they celebrate hard work they also place a lot of emphasis on positive ‘learning habits’ such as empathy, kindness, perseverance, open mindedness etc. The boys do a lot of sport both on the common and in the school, and also music, clubs etc. The online learning was fantastic, which I know won’t be relevant but I think is a good testament to the school. My son was in year 1 he only did half a term but they typically had 3 live zooms per day teaching, plus option of these pre-recorded in case the timing inconvenient, work typically marked within 24h. And it wasn’t just the ‘core’ subjects, if you wanted to they also had music, French, art and games via Seesaw too.
Re where they go after the pre-prep, I think it is a mix. The vast majority go on to the Prep school, and I think most stay till year 8 but some leave on the 10/11 plus route- worth talking to Mrs Seagrave the head of the Prep school who is lovely. They have very impressive leavers destinations, both boarding and London schools (St Paul’s, Westminster, Eton, Radley at the academic end), but with lots of emphasis on finding the right school for the child.
Good luck with your decision making!