Ok... so you'd let a 9 yo travel from Birmingham to London, arriving 8:30 if the train is on time, and then get to Heathrow?
Obviously that's not what I meant, don't be silly.
As I said, i was referring to the fact that many kids in London travel to school by tube, often across town.
I started travelling to school by tube a couple of weeks after my 11th birthday (I'm the youngest in my year).
So 5 or maybe nearly 6 years younger than this person.
As I've also said repeatedly, There's a huge difference between him saying he doesnt want to travel alone and what is happening here, which is the op refusing to even give him the option.
So long as they can do what they need to travel-wise at the point they actually need to, what's the hurry?
Don't you think that a 15 year old might make those decisions for themselves, rather than having their mum unilaterally decide for them?
15!!