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I'm used to both systems, and don't have a problem with the Métro signs.
The main difference is the use of (to give a Piccadilly line example)
"Uxbridge/Heathrow" and "Cockfosters" instead of "westbound" and
"eastbound". In what way did you feel the signage was incomplete?

I find the description of the northbound Piccadilly line from Kings
Cross to Cockfosters as "Eastbound" to be utterly counter-intuitive.

Peter