TfL concluded the ride-hailing app firm was not fit and proper to hold a private hire operator licence. Uber's approach and conduct demonstrated a lack of corporate responsibility which could have potential public safety and security implications, it said. Uber said it would immediately challenge the decision in the courts. Some 3.5 million passengers and 40,000 drivers use the Uber app in London. Latest updates and reaction In a statement, Uber said: "Transport for London and the mayor have caved in to a small number of people who want to restrict consumer choice." It said the decision showed the world that "far from being open, London is closed to innovative companies".