On Thu, 11 Dec 2008 15:40:38 -0000, Paul Scott wrote:
"The money on your Oyster card never
expires - it stays there until you use it.
However, if your card is not used for
2 years, you will have to reactivate it or
claim back any unused cash by calling
the Oyster helpline..."


That might be in theory, but I've left one for more than 2 years (nearly 3)
and it was fine.

Steve