Clive typed

I'm alright because I hardly use the things but what about the tourists?

I'm a tourist, what's the problem?

You won't have a problem as you are English-speaking and well-informed,

I will make sure that visiting relatives use Oyster when appropriate.

I think there *is* a potential problem for ill-informed visitors,
especially if they don't read English.

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Helen D. Vecht:
Edgware.