I personally didn't like the head of St Augustine's - she is not a fan of the grammar system (I actually don't think any of them are, but it's a necessary evil where we are!) and was told that she "actively frowns on parents who do the 11+". They have split classes - so the older half of one year in with the year above if you see what I mean, and as I have two children a school year apart, I didn't want them in the same year.
St John's is good, but we are having issues with our very bright DS1 not being challenged enough - although they may have finally been listening to me as he was given some Y5 maths yesterday (he's Y2), and it was a criticism of their last OFSTED that they don't necessarily challenge the brighter ones, and that writing in the lower part of the school isn't great. I do think that they are addressing that but it takes time. There is a new head (relatively new) after a very established partnership of Head/Deputy Head left last year so we're still finding out what direction she's going in. It is a good school, but very big (although well managed in that respect so it feels smaller than it is).
Claremont is good, but reputation for very pushy uber parents - can't comment as we aren't there, but it does have an excellent reputation for getting children into the grammars - probably good if you have a very academic child; maybe not so good if they aren't as bright as the school would like them to be to keep their stats up.
Secondary is ok if you are religious - if you don't get into the grammars there is an outstanding CofE comprehensive, a good Catholic one, but after that there is a school which was failng and which has now been rebranded as an Academy. I think it will be good, but it's going to take some time for the more middle class parents to 'risk' it (Sorry if that sounds awful, but I hope you know what I'm trying to say.)
Access to town is very easy - I tend to walk everywhere if I can because the traffic is so bad. There are lots of great cafes, bars, restaurants, bistros and the parks are excellent. Grove Park in the Village area; Calverley Grounds in the centre of town with a cafe (great for sledging in the winter!), St John's Park has tennis courts and a great sandpit and new equipment (and we keep being promised a cafe but it hasn't happened yet!) and Grosvenor Park which has a lovely cafe, a bicycle track, big sandpit, basketball court etc.
It's a great place to live honestly and as there are so many London 'expats' everyone is very welcoming and friendly.