Iceland has also performed well since lockdown. Sales rose by 31.4% over the last 12 weeks, giving it a 2.5% market share as founder Malcolm Walker took control of the business again after buying out his South African partners.
Kantar added that British shopping habits have changed markedly since lockdown began with people buying much more food than normal. Overall sales from UK supermarkets increased by 13.7% year on year in the 12 weeks to 14 June 2020.
Kantar could not explain why people are buying more food.
McKevitt added: "Customers are continuing to buy more than usual, spending 42% more per trip than in June last year at £26.37 on average."
Tesco, Sainsbury's, Asda, Morrisons, Waitrose Lidl and Aldi all reported strong sales.
