A commuter was spotted wearing a hazmat suit on a bus as thousands more Londoners returned to work this week.
As Covid-19 lockdown measures continue to ease, it has now been made mandatory for people to wear a mask or face covering on public transport.
Passengers caught not complying with the regulations risk being fined £100 and removed from services.
Face coverings can be a scarf, piece of cloth, mask... or in the case of one commuter, a hazmat suit.
Evening Standard photographer Jeremy Selwyn spotted the man taking a ride on a bus in Westminster on Tuesday.
It comes as more than 3,000 additional staff from British Transport Police, Network Rail, train operators and Transport for London (TfL) are being deployed at major stations and transport hubs to ensure the new rules are being followed.
The regulations fall under the Public Health Act 1984 and make face coverings mandatory on buses, coaches, trams, ferries, aircraft and trains in England.
People with certain health conditions, disabled people and children aged under 11 do not have to wear one.
TfL figures show there was a 17 per cent increase in the number of Tube journeys made on Monday up to 10am compared with a week earlier.
Motor traffic in cities across the UK was also up on Monday.
Data published by location technology firm TomTom showed the congestion level in London at 3pm was 27 per cent, up from 25 per cent during the same time last week.
