Which? compared prices for a trolley of 20 items every day throughout May and found, on average, shoppers paid £22.66 at Lidl, beating the big four and Aldi. Products checked included own-label products such as tomatoes and chicken drumsticks and branded goods such as Nescafé coffee.
A spokesman said: “Earlier this year, Which? named Lidl as the Cheapest Supermarket 2020, demonstrating that Lidl continues to offer UK shoppers consistently unbeatable prices.”