Tesco and Asda have joined other major UK supermarkets in hardening their approach to shoppers who refuse to wear a face covering, saying they will be denied entry. Laws enacted in the spring mandate face-coverings in indoor public areas, with exceptions, but stores have generally taken a light-touch approach, preferring to offer masks for free, but not to challenge. On Monday, Morrisons became the first supermarket to explicitly state it would prevent entry to people who refuse to wear face-coverings, unless medically exempt. Later Sainsbury’s announced it was toughening its stance, followed by Tesco and Asda on Tuesday. Sometimes called the “Big Four”, these supermarkets make up two-thirds of the sector by market share. The shift in policy chimes with a tougher approach by police under England’s third lockdown to the enforcement of laws aimed at stemming the spread of the CCP (Chinese Communist Party) virus, commonly known as the …