hello OP.
I'm in complete agreement with Insert.
DS is in year 9 and whilst timing is appalling we are heading back to London this summer. For many reasons, but also because junior simply has no western peers he's particularly close to. Whilst the quality of education at secondary is good enough, most kids go back to their home countries to board.
Actually a number of local kids from DS class are off the the UK this month.
Kellett for sure would be the obvious choice, but also check out ESF. They are all run differently but I know West Island is a good one. it is IB though. The French international has an English stream, but also IB.
I will say that most international schools are mostly filled with locals, who chat in Cantonese, despite being asked not to.
I will also say that club life is where western friendships are made. Hong Kong Football Club, HK Cricket Club, American Club all full of sport. And the FCC, which is a swanky journalist Club so hopeless for kids. But very lovely all the same.
The Club at Repulse Bay is a great place...swimming, tennis, performance art . probably best for youngsters, but the drama department is great.
Do you have the option for membership ? That may well be your saving grace. football club has hockey and tennis, and many more sports teams.
Good luck!