Bus drivers suffering "chronic levels" of exhaustion could be holding strikes in London, a union has warned.

Unite will be holding a consultative ballot among its 20,000 members in the city, which could lead to a formal vote on whether to launch industrial action.

The union said it was calling for action to tackle fatigue being experienced by bus drivers, including proper breaks and making sure they finish their shifts on time.

Unite regional officer John Murphy said: "London bus drivers have had enough. They are permanently fatigued and at risk of being a danger to other road users, bus passengers and themselves.

"Unite will shortly be conducting a consultative ballot and provided our members endorse industrial action, strikes will follow later this year unless action is taken to ensure that the problems causing chronic fatigue for our members are resolved."