Commenting on figures showing that Transport for London has retained £55m in cash balances on Oyster cards that are no longer used, Caroline Pidgeon told the BBC:
"Transport for London is now sitting on a cash pile of £55m which should be returned to passengers.
"TfL claim people can easily reclaim their money from dormant Oyster cards but the evidence suggests otherwise. If it really was simple for passengers to reclaim their money, why has the amount left on dormant Oyster cards doubled in the last two years?"
You can read more on the Going Underground blog, which highlights this issue and also the work Caroline has done in exposing the overcharging of passengers for "incomplete" journeys on Oyster.