Aldi has been recognized as the most economical supermarket in 2025 by consumer advocacy group Which?. Which? monitors grocery prices daily and discloses the most budget-friendly stores monthly. Throughout 2025, Aldi maintained its position as the UK’s most affordable supermarket for the fifth consecutive year by being the cheapest in ten out of 12 months.
In December, Aldi led as the most budget-friendly supermarket for a selection of 68 items, with an average monthly cost of £123.60. Lidl closely followed in second place, only 10p more expensive with an average cost of £123.70 for both Lidl Plus members and non-members.
Throughout the year, Lidl claimed the title of the cheapest supermarket twice, in July and October. The average price difference per month between Aldi and Lidl was a mere 77p.
Comparatively, for the same set of 68 items at Asda, the average cost in December was £134.89, while Tesco Clubcard members paid £135.84, or £139.12 without a Clubcard.
Sainsbury’s Nectar card holders spent £141.45 in December, or £143.74 without a Nectar card. On the other hand, Waitrose stood out as the priciest supermarket for the 68 items list, totaling £170.46 in December.
Research by Which? unveiled that Waitrose was on average 35% more expensive than Aldi throughout 2025. Additionally, a comparison was made for a larger weekly shop of 180 items.
Aldi and Lidl were excluded from this comparison due to their smaller product ranges. Asda emerged as the most economical option in December for the larger list of 180 items, with an average bill of £450.82.
For the same items in December, Tesco Clubcard holders paid £462 on average, while non-Clubcard holders paid £493.53. The bill for Morrisons shoppers with a loyalty discount was £466.04, or £467.46 without. Sainsbury’s Nectar card holders paid £468.61, and non-members paid £501.89.
Waitrose retained its position as the most expensive supermarket for the larger shopping list, with an average bill of £529.17. The analysis by Which? took into account special offers and loyalty prices, excluding multibuys.
Reena Sewraz, Which? Retail Editor, commented on Aldi’s consistent performance as the UK’s most affordable supermarket for the fifth consecutive year, emphasizing the importance of comparing prices to save money on groceries.