Boris Johnson believes it is important face masks are worn in shops and says they add a "great deal of value" in confined spaces.
The Prime Minister indicated the Government was looking at toughening up rules for wearing masks in shops with a decision expected in the next few days.
MirrorOnine reports the Prime Minister confirmed the Government was looking into whether to make it compulsory for everyone.
He said: "They have a great deal of value in confined spaces where you're coming into contact with people you don't normally meet," the Prime Minister told reporters during a visit to the London Ambulance Service.
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"The scientific evaluation of face coverings and their importance on stopping aerosol droplets, that's been growing, so I do think that in shops it is very important to wear a face covering if you're going to be in a confined space and you want to protect other people and receive protection in turn."
"Yes, face coverings, I think people should be wearing in shops, and in terms of how we do that - whether we will be making that mandatory or not - we will be looking at the guidance, we will be saying a little bit more in the next few days."
Over the weekend, Cabinet Office Minister Michael Gove said it should be voluntary.
Labour has called on Mr Johnson to make face coverings compulsory in shops in England – as they are on public transport.