Aldi has retained its title as the UK’s cheapest supermarket in September, costing £102.68 for a basket of 65 items, according to Which?.

The consumer watchdog found that in comparison to Waitrose, which was found to be the most expensive supermarket at £130.37, the discount grocer was £27.69 cheaper.

Rival discounter Lidl was just £1.18 more expensive at £103.86, followed by Asda at £112.19.

When comparing the price of 65 items at Tesco and Sainsbury’s compared with the supermarket’s loyalty scheme prices, Which? found that Tesco Clubcard offered the lowest cost at £112.96, followed by Tesco without a Clubcard at £113.35.

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Meanwhile, Sainsbury’s with Nectar savings was just 44p more expensive than Tesco at £113.79, followed by Morrisons at £119.18 and Sainsbury’s without Nectar, just 1p more at £119.19.

Elsewhere, Ocado was the second most expensive supermarket, costing £125.16.

Commenting on the results, Aldi UK managing director of buying Julie Ashfield said: “Shoppers are already thinking ahead to Christmas and how they can afford a great festive season without breaking the bank. It’s reassuring that switching to Aldi will help shoppers save for the big day.

“We have always said that other supermarkets can try to match us on quality or price, but never both. The Which? results confirms the only place shoppers can get Aldi prices and high quality products is at Aldi.”