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UK's cheapest and most expensive supermarkets

Asda, Tesco, Sainsbury's and Morrisons shopping bags in a car boot. Photo: Chris Radburn/PA

Asda was the nation’s cheapest supermarket in September, for the second month in a row, according to research by Which?

The consumers’ association analysed a basket of 66 grocery items across six supermarkets to find the cheapest and most expensive places to shop.

These items included Andrex toilet tissue, Branston baked beans, Knorr vegetable stock cubes, Lurpak Spreadable (unsalted) butter, McVitie’s Hobnobs and PG Tips tea bags, as well as everyday essentials like toothpaste and cleaning detergent.

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Asda came out cheapest, with the basket of groceries costing just £129.50. The calculations included special officers but not multi-buys.

Meanwhile, Waitrose was the most expensive for seventh month in a row. The same basket of groceries came to £143.85 at Waitrose – £14.35 more than at Asda.

Sainsbury’s (SBRY.L) was the second-cheapest supermarket, with basket coming to £132.97. And Morrisons (MRW.L) third at £135.85.

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Tesco (TSCO.L) was the fourth-cheapest supermarket, at £141.92. This places it “firmly in the middle of high-end and cheaper competitors”, a spot it has occupied for eight of the nine months Which? has looked at so far, the consumer’s association said.

Online supermarket Ocado (OCDO.L) was the second-most expensive, with the basket of goods costing £142.38.

Which? said it was unable to include Aldi or Lidl in the ranking, as these shops do not sell branded groceries online.

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However, Aldi and Lidll were ranked highest – the only two stores to score five stars – in value for money in Which?’s latest customer survey.

Brits said Waitrose is their favourite supermarket overall, ranking it highly in range of products, in-store experience, queuing time, staff availability, and quality of own-label and fresh products.