The mayor’s spokesperson said Sir Sadiq and TfL “take London’s bus drivers’ safety and welfare very seriously”.
They added: “The mayor is in close contact with TfL during the heatwave and has asked that they work with bus operators to put in place more support for drivers.
“This is in addition to the comprehensive hot weather plan in place to protect all staff and customers during the warm weather.
“All driver cabs are fitted with air-cooling systems and checks on these are taking place.
“If air-cooling systems on a vehicle are not functioning and drivers do not feel they can carry out their duties safely, they should contact the controller and stop driving, with no risk of any penalties.”
Sir Sadiq said he encouraged any driver with concerns to contact their employer, their union, or a confidential reporting service, saying they would be taken seriously and fully investigated.
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