The tussle to be named Which? cheapest supermarket is incredibly low stakes: Aldi has taken the crown back from Lidl, July’s winner, to be named the UK’s Cheapest Supermarket in August. Why low stakes, you wonder. Well, out of the past 22 months, Aldi has only lost once, and that was to Lidl last month.
To determine the UK’s cheapest supermarket, Which? buys the same 75 item shopping list, containing branded and non-branded products, at each of the UK’s supermarkets. If the supermarket offers a loyalty scheme, Which? makes a separate list using products with member-exclusive prices.
Aldi UK’s Chief Commercial Officer, Julie Ashfield commented: “We’re delighted to once again be recognised by Which? as the UK’s cheapest supermarket.
We are committed to providing shoppers with the best possible value, but not only that, we’ve gained this title while always ensuring our product quality remains consistently high.”
Top of the tree – again – is Aldi, with Which?’s 75 items costing £127.92. In second and third place is Lidl Plus (£128.30) and Lidl (£128.35), respectively. With only 43p between Aldi and third place Lidl, it’s not worth changing where you shop.
Down in fourth is Asda, with the 75 items costing £139.42.
According to the Which? August survey, shopping with Nectar and Clubcard is cheaper than leaving your loyalty cards at home when you head to Sainsbury’s or Tesco.
But, remember, just because Which? says a supermarket is cheapest, it doesn’t mean that’s how you’ll experience it. For example:
Cherie, our in-house shopper, found her shop to be more expensive using Tesco Clubcard than without in August – the opposite way round to Which?.
At the other end of the list, however, we have no disagreements. In the Which? data for August, Waitrose is still bringing up the rear with the list costing £172.61. For all eight months of 2025 and the whole of 2024, Waitrose has been the most expensive supermarket.
We found Waitrose the most expensive for a pizza night in, mid-table for a chicken roast dinner, and one place off of most expensive when it comes to caterpillar cakes (Colin is the only one costing more per slice than Cecil).
