In the latest incident, a man was stabbed on Friday morning as he waited to start his driving shift at Southall bus garage.

It comes after 64 year old Sergi Krajev died on May the 19th after being assaulted on Battersea Bridge while on shift.

Unite believes that the advice to drivers that they should remain in their cab at all times needs to be urgently revised.

Unite general secretary Sharon Graham said: “This is another shocking attack on a bus driver. No one should go to work fearing they will be attacked.

“The Mayor of London together with TfL, the private bus operators must be brought together with Unite to develop concrete solutions to better protect London bus drivers.”

Unite believes that the advice to drivers that they should remain in their cab at all times needs to be urgently revised. The union says that in both recent cases, it was impossible for the driver to have remained in their cab.

Unite is also calling for training provided to London Underground workers on how to diffuse potentially violent situations, must be extended to all London bus drivers.

Unite regional officer Nadine Edwards: “The current advice to drivers to always remain in their cabs is both flawed and impractical.

“We urgently need fresh guidance and full training for drivers to ensure that they do not put themselves in danger.”

We’ve contacted Transport for London for comment.