@NeedBathAdvice my daughter went through the Junior School at KES - she loved it. Not all the children are, but it is helpful to be sporty and willing to try new things. There are 3 hours of games/week and an hour of PE/swimming alongside sporty clubs before/during/after school.
A fair few lessons take place outdoors and there seemed to be plenty of trips, the highlight being activities week when the school sends each year off to various outdoor activity centres (or France in year 5) and parents go somewhere -nice.
DD seemed to have very little homework but, to hear other parents, I sometimes wondered whether the children were all at the same school. We all concluded that the 'smart or focussed' kids just did most of their work in class whereas the perfectionists and day-dreamers ended up doing far more work at home as a result. As the children progress through the school some of the senior school staff pop over to do teaching (nearly every child moves up to the Senior School and the year almost doubles in size).
Music features quite heavily too - stringed instruments in year 3, woodwind and brass year 4, Indonesian things year 5, steel pans year 6 and most children learn an instrument on top of that.
If your child is a day dreamer, KES isn't for them. The senior school is selective (but not overly so) and, again, parents perceptions of the amount of work their child is doing in the years 7 & 8 varies markedly.
One big difference might be Saturday school - certainly Monkton insist(ed) on it?
You'd probably get a good idea about what the kids get up to by looking at their twitter feed "@kesbathjunior".