Very often in London I see big groups of young children (and teens as well) being accompanied by their teachers on the tube. Presumably they are on school trips.
Why don't they charter a bus though? When I was in school we always hired a bus for our trips to the museums, zoo, etc. We could sit with our friends and sing songs and play games. Why would anyone choose to transport a big group of children on the tube? No one gets to sit down, the teachers have to constantly watch out for kids falling over, wandering off...
I'm genuinely curious so could anyone weigh in? As a parent I think I'd prefer my children being transported in a private hire bus, unless travelling on the tube is part of the purpose of the whole excursion.