"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 protest is due to be held outside tonight's BAFTAs against what is being described as a lack of diversity in the film industry.
A Muslim teenager who it is feared wants to travel to Syria to become a Jihadi bride should be watching more TV, a judge has been told.
Police investigating the murder of a grandfather from West Ham have arrested a second man on suspicion of murder.