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16 May 2012, 11:28 | Updated: 16 May 2012, 11:40
Bus drivers have been outside Transport for London headquarters.
They arrived on an open top double-decker bus as part of a protest about not getting extra pay during the Olympics.
The Unite union is balloting members on strike action - saying it's unfair that other transport workers will receive rewards of up to £850.
Boris Johnson has said its an issue for the bus companies to resolve.