A man wearing a face mask sits in a tram at Manchester Victoria Railway Station in Manchester, Britain, on June 15, 2020. As non-essential stores reopen and more students head back to schools in England on Monday for the first time in almost three-months, a new rule also came into force requiring people travelling on public transport to wear face coverings during their journeys. Under the new rule, people in England travelling on trains, buses and commuter ferries, as well as the London Underground, must wear face coverings during their journeys. (Photo by Jon Super/Xinhua)

Photo taken on June 15, 2020 shows a sign instructing the public to make face covering at a bus station in London, Britain. As non-essential stores reopen and more students head back to schools in England on Monday for the first time in almost three-months, a new rule also came into force requiring people travelling on public transport to wear face coverings during their journeys. Under the new rule, people in England travelling on trains, buses and commuter ferries, as well as the London Underground, must wear face coverings during their journeys. (Photo by Tim Ireland/Xinhua)

A man wearing a mask gets off a tram at Manchester Victoria Railway Station in Manchester, Britain, on June 15, 2020. As non-essential stores reopen and more students head back to schools in England on Monday for the first time in almost three-months, a new rule also came into force requiring people travelling on public transport to wear face coverings during their journeys. Under the new rule, people in England travelling on trains, buses and commuter ferries, as well as the London Underground, must wear face coverings during their journeys. (Photo by Jon Super/Xinhua)

A woman wearing a face mask walks into a subway station in London, Britain, on June 15, 2020. As non-essential stores reopen and more students head back to schools in England on Monday for the first time in almost three-months, a new rule also came into force requiring people travelling on public transport to wear face coverings during their journeys. Under the new rule, people in England travelling on trains, buses and commuter ferries, as well as the London Underground, must wear face coverings during their journeys. (Photo by Tim Ireland/Xinhua)

People wear face masks as they take a bus in London, Britain, on June 15, 2020. As non-essential stores reopen and more students head back to schools in England on Monday for the first time in almost three-months, a new rule also came into force requiring people travelling on public transport to wear face coverings during their journeys. Under the new rule, people in England travelling on trains, buses and commuter ferries, as well as the London Underground, must wear face coverings during their journeys. (Photo by Tim Ireland/Xinhua)