Greater Manchester mayor Andy Burnham has hit out at Tesco and other supermarkets for failing to enforce face covering rules to make sure stores are "Covid safe".
Giving evidence to the Lords economic affairs committee on Tuesday, Mayor Burnham said local leaders were unsuccessful in attempts to demand greater coronavirus powers from the Government to temporarily shut down stores not following the rules.
He singled out supermarket giant Tesco by saying the firm did not take a "responsible attitude" to masks.
Tesco said there is "clear signage" at stores to encourage customers to wear face coverings, but said employees would be under "increased risk of verbal and physical abuse" if they were told to enforce their use.
Mayor Burnham, who resisted Tier 3 lockdown measures for his region while demanding greater funding, said local leaders had also called for "summary closure powers" for firms "not deemed to be Covid-safe".
"I'm not just talking about pubs and restaurants. There are large supermarkets in Greater Manchester who in my view have not properly implemented the requirements around face coverings," he said.
"And I'll name one chain: Tesco.
"I don't believe they've taken a responsible attitude to this issue. They've said it's not for them to enforce. Well, I do think it is for those organisations to enforce."
The Labour mayor said the local enforcement powers to temporarily close venues failing to adhere to the Covid-19 rules would be a better approach than "blanket restrictions".
The criticism comes after Tesco was forced to apologise for wrongly suggesting sanitary products were "non-essential" and therefore could not be sold under new restrictions in Wales.
Prime Minister Boris Johnson eventually imposed the toughest coronavirus restrictions on Greater Manchester after the row with Mayor Burnham and other local politicians, including Tories.
Under the Tier 3 measures for English areas, pubs and bars that do not serve substantial meals have been ordered to close and household mixing is banned indoors.
Across the UK, masks are compulsory on public transport and in shops and failure to wear them can result in fines.
Guidance from the Westminster Government states that premises "should take reasonable steps to promote compliance with the law" but enforcement powers lie with the police.
A Tesco spokeswoman said: "The Government has set out reasons why customers may be exempt from wearing face coverings and has made clear that it is for the police, rather than individual retailers, to enforce this or determine if an exemption applies.
"Our colleagues do not have enforcement powers, and asking them to do this would put them at increased risk of verbal and physical abuse."
