In their latest analysis of supermarket prices, Which? has found Lidl to be cheaper than Aldi, the first time any supermarket has beaten them in 20 months. Which? compared the price of buying a 76 item list at each UK supermarket, with and without loyalty scheme discounts.
For their research, Which? compares the price of their list monthly. It isn’t always 76 items, in June it was 79 and in January it was 100. But importantly, the items they buy at each supermarket are the same for a fair comparison. Throughout the entirety of 2024, Aldi proved unbeatable – a lead that continued until June 2025. We saw the exact same thing when comparing the price of a Sunday roast, Aldi reigned supreme.
July’s price comparision, however, saw Lidl snatch the crown by a narrow £1.25 margin. You will need a Lidl Plus card to access the July 2025 winning price of £128, but Lidl didn’t just knock Aldi off the top spot with bonus card discounts. Aldi slid right down to third place, with Lidl’s non-member shopping list only costing £0.40 more than buying the same items with the Plus card.
As Aldi doesn’t offer a loyalty scheme, it wouldn’t be fair to compare it to Lidl Plus, but as regular Lidl also come in cheaper, it’s a fair fight.
But what about the other supermarkets?
Of the big three – Sainsbury’s, Tesco, and Asda – it also became a battle of the membership cards. Even without member-exclusive prices, Asda is cheapest at £139.53.
Positions fifth and sixth on the list are Tesco Clubcard and Sainsbury’s Nectar, at £141.92 and £144.21 respectively. Without taking advantage of their loyalty schemes, you’ll expect to pay around £3-£5 extra for your basket.
There has been no change at the other end of the table, with Waitrose remaining the most expensive supermarket in 2025 so far. According to Which?’s data, Waitrose remained the most expensive supermarket throughout the whole of 2024. We’ll have to wait and see if any supermarket manages to steal Waitrose’s wooden spoon.
