WATCH: Mayor of London tells local cabbie to 'F**k off and die'

One has a potty mouth.

London Mayor Boris Johnson was filmed earlier this morning having a furious row with a cab driver in the city.

Johnson, who’s also a Conservative MP for Uxbridge and South Ruislip, was cycling home (as he is famously known for) on St John’s Street in Islington when he became embroiled in foul-mouthed altercation with the taxi driver over the cab-booking service Uber.