Quote Originally Posted by Al 10000 View Post
Thanks for the quick reply Pubsignman,

Another quick question is the Oyster card valid on Souteastern trains from Stratford to St Pancrass.

Thanks Alan
I don't think you can use it on that route. Generally you can use a Pay As You Go Oyster card on any train journey within zones 1-9, but there are a few exceptions to this and the high speed Southeastern service between Stratford International and St Pancras International is one such exception.