OP, I am in the same boat as you, that is, we are looking to move back to the UK in a couple of years. My son also go to UWC. However he is only 6

I have looked at King Edwards in Godalming and they seem to have a similar ethos. However if I send him to private school in the UK then thinking about it, I want him to take advantage of what a good British private school has to offer, which I do not think is necessarily comparable with UWC. If you are looking around the Surrey area then I believe they have great grammar schools e.g. Tiffin boys and girls schools came out great in the recent O'level league tables.