On 25 Jul, 16:49, (David Horne, _the_ chancellor
(*)) wrote:
Also, am I correct in understanding that
oyster PAYG works for Chiltern Railways in the LT area? I've a US friend
visiting soon, and I was going to lend him one of my oyster cards- and
he's intending to visit Wembley while in London.

Out of luck - they only work on Chiltern where they share an station
with LU.