They took on the task of comparing 74 branded and own-branded items at Aldi, Asda, Lidl, Morrisons, Ocado, Sainsbury’s, Tesco and Waitrose every August day, to find out where it is best to shop.
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This included some of your most frequent purchases, from semi-skimmed milk, free-range eggs to wholemeal bread to figure out who’s cheapest on average.
The difference between the cheapest and the most expensive supermarkets was almost £ 40 – from £ 66.45 to £ 105.25.
The cheapest supermarket last month was Aldi according to their research with a whopping £ 66.45.
Lidl was just behind by a fraction at £ 67.17 with Asda slightly above at £ 74.12.
Waitrose was much more expensive, as you would expect, at £ 105.25 for the same items.
Which? also tested the purchase of 165 items – the original 74 and 91 others – to see how a full cart would compare.
Using branded items such as Branston Baked Beans and Flash Cleaner Spray, Asda came in the cheapest – where Aldi and Lidl didn’t have those popular branded items.
Asda’s ‘full cart’ of popular products came in at £ 256.31, compared to Waitrose at £ 322.87.
Nearby, Tesco cost only £ 15.41 more than Asda, making it the second cheapest of the ‘big four’.
So if you’re looking for a good deal, it’s no surprise that discount stores like Lidl and Aldi have recently come out on top.