Where did I say it was unproblematic or a great service? I didn't.
You asked what happens in school holidays - I answered.
Out of curiosity, I looked up my old private school to see what they offer. As well as full-time, weekly or occasional boarding, they offer an extended school day as standard - so children can be dropped off anytime from 7am and picked up anytime between the end of the school day (3pm) and 8.30pm. That's at no extra cost and includes, breakfast, dinner, snacks, free play/time and clubs.
During the holidays, they have a full-time holiday club for ages 5-12 at a cost of £37 per day including all meals. There are also various other camps for different sports or activities too.
If I was a full-time working parent with a long commute I could see the appeal. No need to worry about needing to collect by 6pm. No need to panic if the train is late or a meeting over-runs. No need to panic about rushing home to feed children after a long day - it's all sorted for you.
I read lots of threads from stressed out parents who hate having to come straight in from work and organise homework and cook dinner - they get tons of sympathy, but any parent who dares outsource any of it is suddenly an awful person who doesn't care about her kids 