Ride-hailing service Uber lost a court battle on Friday to stop a London regulator from forcing private hire drivers to prove their reading and writing skills in English, the latest setback for the firm in London which could now lose some workers. From a report: The ride-hailing app went to court after Transport for London (TfL) said that drivers should have to prove their ability to communicate in English. Uber argued that the standard of reading and writing required by the test was too high. The US firm said the test was "unfair and disproportionate" and it would appeal against the court's decision. The ruling will also apply to all minicab firms in London. "TfL are entitled to require private hire drivers to demonstrate English language compliance," said Judge John Mitting as he rejected Uber's claim. Tom de la Mare QC, for Uber and the drivers, told the judge that the language requirement would result in 70,000 applicants failing to obtain a licence over three years. The proposals would have a disproportionate impact on drivers from countries where English was not generally spoken and give rise to "indirect discrimination on grounds of race and nationality."