In article om,
Grendel writes
On another note, a driver on the 419 route from Hammersmith to Richmond
yesterday tried to tell me that all Travelcards were not valid for all
bus travel in London, regardless of their zones. I pointed out he was
completely wrong, and he let me travel after a small amount of polite
argument.

You should worry. I got chucked off a bus once with a valid Travelcard
because "it's got the wrong logo on it".

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