Mizter T wrote:

To confirm that my understanding is correct, I've touched my Oyster
card on numerous interchange readers/ validators (i.e. yellow ones as
well as pink ones) within stations whilst en-route - e.g. at
Stratford, at Moorgate/ Old Street (to or from Great Northern), at
Farringdon (to or from Thameslink) etc - to no ill effect at all.

Thanks for the explanation (and Andy's earlier) - however it does cloud the
situation for the traveller from outside the zones who is surely looking for
a yellow reader, if only because that's what the documentation suggests he
should be looking for?

Paul S