Matthew Dickinson wrote:

Mastercard Paypass & Visa Wave cards seem to be TfL's eventual
solution for overseas tourists.

Interesting idea. Alas, although my primary credit card has Paypass, I
don't use that card overseas, as it, like most (American?) credit cards,
tacks on a 3% international transaction fee. Instead, I use my Capital
One card - the only major (AFAIK) American credit card provider not to
charge an international transaction fee - but I don't believe that
Capital One offers Paypass yet.
--
David of Broadway