Tesco, Asda and Waitrose will not let shoppers into their stores if they are not wearing a face covering, the British supermarket groups said on Tuesday (Jan 12), joining rivals Sainsbury's and Morrisons which made the policy change a day earlier.
In a statement, Morrisons chief executive David Potts said: "Those who are offered a face covering and decline to wear one won't be allowed to shop at Morrisons unless they are medically exempt".
"Our store colleagues are working hard to feed you and your family, please be kind".
Tesco said it was also asking customers to shop alone, unless they are a carer or with children. "To support our colleagues, we will have additional security in stores to help manage this".
Anyone who does not have a face covering when they visit will be offered one by store staff at the entrance.
"But should a customer refuse to wear a covering without a valid medical reason and be in any way challenging to our colleagues about doing so - our security colleagues will refuse their entry", it said.
The John Lewis Partnership also said face coverings would be mandatory at its Waitrose supermarkets.
The supermarket giant has introduced the measures across the United Kingdom amid concerns that social distancing measures are not being adhered to in supermarkets.
Lidl said they would "remind those not wearing a face covering of the Government guidelines and their own responsibility to keep themselves and others safe".
Sainsbury's said it was also putting trained security guards at the front of its stores to challenge shoppers.
Supermarket chain Morrisons has vowed to ban customers flouting face mask rules from today onwards.
Iceland said it would take a similar approach, adding the vast majority of its customers continued to shop in compliance with the law. In Scotland, Northern Ireland and Wales, a £60 fine can be imposed.