Sadiq Khan asks TfL to make mask wearing a ‘condition of carriage’ after July 19 14/07/2021, 12:09 am Mayor of London Sadiq Khan has asked TfL to keep its mask requirement in place after July 19 (Stefan Rousseau/PA) Sadiq Khan has asked Transport for London (TfL) to enforce the use of mask wearing on buses and trains as a “condition of carriage”, even after legal restrictions have been lifted on July 19. The London mayor said he was “not prepared” to put tube, tram and other transport users in the capital “at risk” by removing the rules on face coverings after so-called “freedom day”.