Have just dropped DS2 off in Bloomsbury, at the registration centre for his summer school.
It happens to be across the street from the halls of residence where I lived in my first year at university.
It's not just him who is outside his comfort zone. I've just left a young person with ASD at a place he's never been, where there is nobody he knows, and where he has never done the journey home. 
I informed the staff of his SEN, have given him a map and a tube journey plan.