This morning I did the bus journey with my son to Stratford and though 45-50 minutes it was a do-able one. The bus was nice and clean and I spoke to a couple of school children who take the bus everyday (Henley-in-Arden School). I am aware he will have other school children on the same bus and will be fine.
CHB is about 20 minutes away and like you mentioned Lemur, has a higher number of Oxbridge/Higher education statistics. Contrastingly, again like you said, KES has other plus points. We found it odd too that CHB offers just the 2 Languages.
Went to visit CHB again yesterday and very impressed with the Head, facilities etc. Equally, we love KES too and our son likes both aaaaargh!!!!!!
Thank you everyone for your comments and support, it is very helpful and reassuring to see that we aren't the only ones facing dilemmas. Lemur - you will have to keep me posted on what you decide in the end as you are in exactly the same situation.
The problem, however, still remains because we are soooooo confused......
Try flipping a coin