Small class sizes have been proven NOT to offer a significant advantage - it is a myth perpetuated and re-inforced by private schools to justify their existence!
Ask yourself, what will be covered by the bursary? They don't always cover the incidental costs, such as uniform and trip money (you may be able to apply for support with compulsory curriculum trips, but what about those nice to have ones, that a high proportion of the girls at Kings High will be able to afford?)
I will pm you.
I think small class sizes are a significant advantage for SOME. Definitely in our case. THose children who are not so good at speaking up tend to get lost in a big class, or in case of one of my DS's, doesn't want to admit if doesn't 'get' something and its far more quickly noticed in a small class. So completely down to individual child on that one.
Uniform more expensive at the Grammar school and so far all the trips are too. Not a complaint, just a fact for our experience.
Just like state schools, indies can vary widely, so I am not dismissing KCG experience or opinion, but just putting my experience for balance.
Can't comment on either school as do not have girls.