***There was a significant failure of TfL's Oyster ticketing system this morning with readers on both buses and Tube stations unable to read the cards.
As a consequence a significant number of Oyster cards have been corrupted...
UPDATE: Cards used in the last 24 hours are most likely to be affected, with the system unable to recognise them
UPDATE 2: Understood to be over 100,000 Oyster cards affected***
