[quote jlangthorn]@Lily7050 (sorry about my fat fingers)
It's easily commutable and the head and teachers we met were great, boys seemed very happy and confident. There is also automatic entry into their Prep in Marylebone which has amazing results (plenty of entries into Eton Harrow Winchester and all the familiar London day schools). The only thing letting it down a tad for us is that it's owned by private equity and also some of the parents seem a little ostentatious...but we are willing to overlook those things for great teaching and convenient commute.
From my research there are 3 'academic' schools for boys near-ish SW6: WK, Falkner House and Eaton House Belgravia. (By academic I mean schools that will actively prepare for 7/8+ and routinely has entries into WUS SPJS etc.)
Out of these three, we felt Eaton House Belgravia was quite old fashioned and distance-wise too far for us.
Falkner House we really liked but the boys school has only been around for a few years and Mrs Dixon and Mrs Griggs, although lovely and run a formidable girls school, doesn't have a lot of hands on experience with teaching boys, which are VERY different to girls in how they learn. They are also very selective about who they put forward for 7/8+ preparations and most of the boys would end up staying at FH until 11. Which is fine but then they would need to go elsewhere from 11-13 if boarding is in consideration.
WK on the other hand, start teaching with 7/8+ in mind right from the get go, the head was deputy at the NH branch for years and I heard great things about her and she was knowledgeable and answered all my questions with great detail in person.
Out of the other options, we didn't like Thomas's Fulham as it didn't feel like it has anything outstanding about it. Same with Fulham Prep. Garden House has stopped prepping for 7/8+ so lost its edge somewhat although it seemed like a happy and lovely school.
Anyway I'm sure at the end of the day all of these schools are 'good' in their different ways. It probably comes down to personal feeling/vibe you get and also distance and convenience is a must!
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I would emphasise the importance of distance and convenience for pre-prep/ prep. You will be taking your DC to parties for several years, and parents won't want to travel to your DCs parties if you're not reasonably close.
Don't forget that for boys the admissions process starts in Y6 but doesn't finish until Y8, so if you are aiming for Eton/Winchester etc or St Paul's/Westminster you probably don't want to be moving to a new school at the end of Y6, when you may be sitting on a waiting list, or facing reserve list exams. The process goes from Y6 pre-tests through to Y8 entrance exams, with possible reserve list tests in between. I'd suggest you either move to a prep at 8 or pick a prep you can stay at until 13 in this case.
Don't underestimate Fulham Prep for boys. In DD's year they sent 4 to Eton, 5 to St Paul's, 2 to Winchester and some to Hampton.