Tube cleaners have called a two-day strike which will begin on the day of the Olympics opening ceremony.
ISS and Initial tube cleaners and Carlisle DLR cleaners have voted for industrial action between 5.30 on Friday, July 27 and 5.29 on July 29.
As well as the dispute over Olympic payments, LUL staff are being instructed to take action over the attempted use of under-trained volunteers to make up statutory staffing numbers.
RMT general secretary Bob Crow said: “While the likes of Jeremy Hunt, and the rest of the Government, are sitting in the well-padded VIP seats in the Olympics stadium as a nice little bonus our cleaners on the tube and DLR, who work round the clock in appalling conditions, are being treated like dirt over recognition for the extra workload they will carry from the millions of extra passenger journeys associated with the Games.
“Even at this late hour there is time for the cleaning companies, and Boris Johnson who hires them, to settle this dispute which is about ensuring an inclusive Olympics where everyone shares in the benefits.”
