"We're disappointed that the RMT Union is intending to organise a [strike] ballot. We will continue to progress the constructive discussions that are taking place over this matter with the RMT and our staff representatives."
The Rail Maritime and Transport Union (RMT) is balloting its members in a row over bonus payments for staff working during the Olympics.
More top news
A senior employee at a 4-star London hotel has been jailed for six years for raping a man who he lured to a fake job interview.
Children's charity Kids Company is being investigated by the Metropolitan Police over criminal allegations.
The new list is the first to be published since the general election. Some of those identified owed money to a handful of workers.