Boltar writes
And if you can't spot the difference between the two situations, then
I'm pretty glad that you won't ever be allowed near the workings of an
escalator.

So what do the LU ones have to do that others don't? Please explain cos I'm
all ears....

Sit down, have a nice cup of tea, put on your thinking cap, concentrate
*really* hard and you might just work it out.

--
Dave