Cheapest supermarket named as 'posh' retailer undercuts ASDA, Tesco and Morrisons

The UK's cheapest supermarket for March has been named by consumer experts Which? The cheapest supermarket is now only 25p cheaper than Lidl - but a whopping £20 less than the most expensive supermarket, Waitrose.

Perhaps most interesting is Sainsbury's. The 'posh' supermarket came out cheaper than its rivals ASDA, Tesco and Morrisons.

A basket of 41 grocery items at Aldi cost £72.54 on average across the month, compared with £92.55 at Waitrose and £72.79 at Lidl, Which? Found. A comparison of 137 items – the original 41 as well as another 96 including branded products such as Andrex toilet paper and Cathedral City cheese, and not including Aldi and Lidl, found Asda was the cheapest, costing £343.91.

Sainsbury’s was the next cheapest, costing £9.25 more. Waitrose was £41.83 more expensive than Asda.

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Which? said the findings demonstrated that shoppers can make considerable savings on their groceries depending on where they buy their food. However, it said many of the major supermarkets had not done enough to support their customers during the cost of living crisis.

The watchdog said retailers should be helping customers by making sure affordable basic ranges were available in all branches, including smaller convenience stores, as well as improving unit pricing on all products to allow customers to easily work out the best value.

Which? Retail editor Ele Clark said: “We know people are suffering through the worst cost-of-living crisis in decades and the price of food and drink has skyrocketed no matter where you shop. However, our monthly supermarket analysis shows you could save £20 on a basket of everyday groceries at