According to a trade union, it is mandatory to wear face coverings on public transport.
unite Which represents thousands of transport workers, called for the measure to be implemented due to rising cases of the coronavirus.
The legal requirement for people to wear face covers in most indoor settings such as public transport, shops and hospitality expired on July 19.
Bobby Morton, the Joint National Officer for Passenger Transport, said: “The Government Can no longer pretend that COVID-19 is not a risk, and urgent action needs to be taken to protect key workers and passengers.
“Wearing a mask significantly reduces the risk of infection for both bus workers and passengers.
“It is a sensible measure that the government can and should take that does not harm the economy in any way.”
“The reintroduction of mask-wearing should go hand in hand with the proper enforcement of such rules.”
Transport for London said last week that 98 transport workers in the capital had died of the coronavirus, not including taxi or private hire drivers.
Unite also expressed concern that hospitality workers were being treated with a “lack of respect and dignity” by some members of the public.
Dave Turnbull, the union’s national official for the hospitality sector, said: “Our members are reporting that customers are becoming increasingly abusive when they try to implement the social distancing measures set by the venue.
“This is completely unacceptable. Unite is working to ensure that employers in the hospitality sector protect their employees.