[strttn]

One could argue that this does help everyone when it's particularly busy because it reduces the glut of people waiting to get on the bottom of the escalator, which can slow you down even if you want to walk up.

I suppose from TFL's point of view, the average time take is exactly what they want to optimise too because it everyone through the system quickest.

Personally, I really like walking and I guess I'd be a bit frustrated at not being able to even if it was for the good of the whole. Or even for me personally (time-wise)