Quote: speccyrhino "I have used an oyster card for a few years for my infrequent trips(90% for cc or nfl) to london,there has never been any expiry date on pre loaded money.So as useful this year as last year.'"
Same here, got them a few years ago and just stick a few quid on each time we go down to London, it automatically gets you the cheapest price however you travel.