When was the 1st escalator (moving staircase), installed on the London Tube?

Question

When was the 1st escalator (moving staircase), installed on the London Tube?

Answer 1

Dont know but 10 points should be given to questioner and 10 points given to croadalap

Answer 2

1911 at Earls Court. They even used a bloke with a wooden leg going up it all day just to show how easy it was to use ! ! !

Answer 3

Why are people allowed to post such outlandish answers such as the one above when it has no relationship to the subject?

The answer given by the first poster is correct - and there is little to add !