"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
Oliver Dearlove died 24 hours after receiving the fatal blow outside Morden's wine bar in Blackheath last summer.
She was found in Tadworth in Surrey and is so young the RSPCA can't work out what breed she is.
Unemployed plasterer Trevor Timon had been cleared of Oliver Dearlove's murder but admitted manslaughter.