More should be done to remind Transport for London customers to claim £321m on "dormant" Oyster cards, a London Assembly member has said.
Liberal Democrat Caroline Pidgeon accused Transport for London (TfL) of keeping "incredibly quiet" about the "cash mountain".
TfL is yet to respond to her remarks but said Oyster cards were "essential".
More than 100 million people have used the electronic travel cards since they were launched 15 years ago.
More than £321m of balances and deposits are sitting on Oyster cards that have not been used for at least a year, TfL figures show.https://www.bbc.co.uk/news/uk-england-londo...ialflow_twitter