Grocery chain the Co-op saw sales rise in the first half of the year as customers shopped closer to home and ate out less during the pandemic.
Like-for-like sales in food, which strip out the effect of new shops opening, increased by 8.8% in the six months to 24 July.
Its boss said: "We are living in unprecedented times, but the response of our Co-op has been exceptional."
Co-op expects coronavirus-related costs to hit £97m for the full year.
Chief executive Steve Murrells told the BBC's Today programme that the boost in sales was largely down to "people shopping more locally during the crisis".
"We're finding that when lockdowns happen... the average basket size doubles, but also local deliveries are very popular."
Mr Murrells added that 1.7 million new households had shopped at a Co-op store for the first time during the pandemic.
Total revenues for the group increased by 7.6% to £5.8bn for the 26 weeks to 4 July, it said in its half-year results.