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Londoners by and large will follow the rules, without too much need for police. The problem is not the issue of enforcement, the problem is the mixed messages and the confused communications, he added. The wearing of face coverings has become compulsory in dozens of countries including France, Germany, Spain, Italyand Greece, which now require coverings to be worn in public places. A woman and child wearing face masks past a coronavirus related artwork displayed on screens in the window of the Flannels clothing store on Oxford Street, in central London, Thursday, May 21, 2020. (AP Photo/Matt Dunham) A growing body of evidence suggests wearing face coverings brings some benefit in preventing the spread of the virus. Lack of strong evidence of their effectiveness should not be considered a problem but the evidence is accumulating that they have a part to play in reducing transmission and also in protecting the wearer.