MANCHESTER, ENGLAND – DECEMBER 22: Shoppers leave a Costco store in Trafford on December 22, 2020 in Manchester, England. A new strain of the Covid-19 virus has led to France closing ports to British goods for 48 hours from Sunday night. This has led to a number of UK supermarkets warning of potential food shortages just a few days before Christmas. (Photo by Anthony Devlin/Getty Images)