DD is currently in Y11.
Her commute is:
7 min walk
50 min train
5 mins change of platform
20 min train
5 min walk
Next year, it will be the same except 20 min tube instead of train. 100% her choice on schools, colleges etc. She doesn't want to even consider anywhere that isn't in London.
Train is much nicer than bus/coach as they have loos, you can walk about, doesn't make you feel sick reading and you can get the laptop out. Tube also fab as very frequent and if train is delayed you aren't missing connections.
She does a huge amount of extra curricular - so stayed late 2 nights a week at school for dance, has music classes outside school another 2 nights a week.
Weekends she has a 2 hour acting class and the odd music commitment, but I've always tried to keep them reasonably free for shopping/family stuff/doing nothing/seeing friends.
In terms of friends, her school is huge, lottery entry and no catchment. Kids come from all over London and beyond. DD has a season ticket and a smart phone, so they just meet up in central London.
I will say that DD is very, very focused on her extra curriculars and so given the option between a party and one of her classes, she would always opt for the class unless it was her absolute BFF. She's pretty gregarious and has a very active social life via FaceTime, but seems perfectly happy not being round at friends houses all the time.
She doesn't know anyone locally - we're pretty rural - so she's very much a London kid who happens to sleep in rural Surrey.
EVERYONE told us we were mad when we started doing it and that we'd last 3 weeks. DD has never ever complained - I think she quite likes the down time on the train in many ways. There has been the odd rescue mission when she's caught the wrong one... but nothing that hasn't been solved by an uber bill at worst.
Very happy to answer any other questions.