slight tangent here but on the lift subject, when I was a kid (7ish) I had reason to be hanging around the LSE and a lad that I knew and I would go into one of the campus buildings which had a lift called a paternoster lift. It was basically a chain of lifts with no doors on a continual loop, at the top and bottom the cubicle moves across to the side to then go down or up. Anyway, at a certain point in the loop two lifts would be adjacent and there was a gap which this lad, as his trick, would scramble through and jump into the adjacent lift. Horrendous visions of how horribly that could have gone wrong!