Mizter T wrote:

Fair enough, but what will happen (soon) on a London Bus: which of the
two elements will "win"; or will it refuse to pick either, claiming you
are trying to use more than one card at once?

I'd imagine the Oyster element would 'win', but lets wait and see.

What happens if the Oyster is out of credit? Does it automatically debit
the PayWave half instead? What happens if your Oyster has insufficient
credit for an all-zones tube journey? Does it decide which element to
charge it to when you touch out? What happens if you make another journey
and hit your daily cap? Does it charge the two journeys to Oyster and a
fractional journey to reach the cap to PayWave? Sounds like coding all the
corner cases could be tricky...

Theo