You need michaelaHpurple - she's the expert. I'm sure she'll be along in a minute!!
I don't have DC at any of these schools (but have friends with DCs at 3 of them).
HH - quite transitory population because it's international, but gets good exit results, not sure how sporty given lack of facilities (in the past it has not been strong), music good. Big school but small classes (10-12)
Thomas's - get ready to throw yourself into it, busy is a good word, selective entry so they will choose you, have heard little tolerance for SEN and average kids can slip through the net, strangely does not post it's exit results on its website so can't judge how academic it is,
Knightsbridge - Head a marmite character, some find him charismatic, others don't like him. relatively new school so unproven academically (head was previously at a school that went to 11, so less experience at a 13+ exit than other schools),
Cameron House - small, no/very little outside space which may be an issue if you have boys. Also means there will be less opportunity for lots of sports teams, orchestra, lots of after school club choice etc. However it's size probably means it is nurturing. Don't know proportion of boys who stay beyond 8, so may be girl top heavy!
Good luck