At a joint press conference flanked by the UK’s chief scientific adviser, Patrick Vallance, and England’s chief medical officer, Chris Whitty, Johnson said that people in England would be required to wear face masks again on public transport and in shops. Downing Street later confirmed that masks would become mandatory in shops and on public transport from “next week” but “all hospitality settings will be exempt”

It is always dangerous to make assumptions with anything Johnson says, but let us assume being 'required' to means it is a legal requirement to, with a fine or other penalty if you are found to be in breach.

What level of rebellion is there likely to be? The vast majority of comments on Facebook alongside the official announcement were people saying they would not. Steve has raised many objections to being required to wear a mask, and if those comments are representative he is far from alone. If it is a legal requirement, how will it be enforced? There are not enough police to do so other than by spot checks.