Aldi has narrowly beaten Lidl as the UK’s cheapest supermarket, according to new research from Which?.

During each month of last year, the consumer organisation tracked hundreds of thousands of grocery prices each across the UK’s biggest supermarkets: Aldi; Asda; Lidl; Morrisons; Ocado; Sainsbury’s; Tesco; and Waitrose.

It found that overall Aldi was the cheapest supermarket for seven consecutive months between June and December, while Lidl was the cheapest from January to May.

Which? said that in December, a basket of 48 groceries was on average £81.63 at Aldi while at Lidl it was priced at £83.24.

Waitrose was over £30 more expensive than Aldi, at £112.62 on average, and was the most expensive supermarket across the 12-month period.

“With food and drink prices putting huge pressure on household budgets, it’s no surprise to see many people turning to discounters like Aldi and Lidl when our research shows they could save up to £31 on a typical shop,” said Reena Sewraz, Which? retail editor. “As well as choosing a supermarket that is cheap overall, you can save in other ways by swapping from branded to cheaper own-brand products and by sticking to a shopping list.”

Having been the cheapest traditional supermarket every month for the past three years, it was unsurprising that Asda was once again the cheapest of the non-budget supermarket retailers.

Based on a larger trolley of 149 products, Asda was cheapest at £355.62 followed by Sainsbury’s - £368.97, Tesco - £375.97, Morrisons - £377.81, and Ocado - £386.68.

At Waitrose the total price came to £406.95, over £50 more expensive than Asda.

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