SHOPPERS could save up to £700 by switching to the UK's “cheapest” supermarket – and using a Clubcard won't help.
A groundbreaking study by the consumer watchdog analysed average food prices to find out which chain was the cheapest for shoppers in March 2025.
Which? went to eight major UK supermarkets and bought 79 items for a weekly shop.
The list of branded as well as own-label staple items included bread, milk and cheese.
And after grocery shopping at eight of the biggest supermarkets, Which? found that shoppers with a Clubcard pay more than at those who go to the UK's cheapest shop.
The cheapest weekly shop of 79 branded and own-label products was done at , according to the watchdog's study.
It cost a mere £133.73 to do a weekly shop at Aldi in March, making it the cheapest out of the eight supermarkets assessed.
Discount grocery seller followed close behind at £134.40 for a weekly shop by those with the Lidl Plus loyalty app.
Those who didn't have the app paid just pennies more, at £134.43 for the 79-item weekly shop.
Out of the traditional supermarkets, was found to be the cheapest.
The supermarket does not have loyalty – and a weekly shop here was figured out to cost £147.09.
Tesco shoppers could undercut this price, but only while using a Clubcard.
Clubcard users at Tesco paid £13.06 more per weekly shop than Aldi shoppers – with the 79-item list costing £146.79.
Over the course of a whole year, the difference in cost compared to Aldi means that Tesco shoppers with a Clubcard pay £679.12 more for 52 weekly shops than Aldi customers.
Without a Clubcard, Tesco shoppers pay £149.83 for the weekly shop -a significant £2.74 more than at Asda.
editor at Which? Reena Sewraz said: “Shoppers are still feeling the effects of food and with prices forecast to rise again, people are likely looking to cut costs where they can.
“Our analysis shows that by switching supermarkets, shoppers could pay 24% less, highlighting the advantages of shopping around where possible.”
The consumer watchdog Which? said: “Over the course of a year, the difference in cost compared to Aldi means that Tesco shoppers with a Clubcard would pay £679.12 more for 52 weekly grocery shops than customers at Aldi, if prices remain at the same level.
“Without a Clubcard, Tesco shoppers would pay £149.83 for the 79 items – £2.74 more than at Asda.”
Which? also compared the average cost of larger shops by analysing a selection of 203 items – the original 79 plus 124 more.
They found that Asda was the cheapest, with the total cost averaging £498.
Clubcard users at Tesco had the second cheapest shop at £503.03, while Tesco shoppers without the loyalty card scheme paid £37.60 more on average.
This made their total cost a whopping £540.63.
was the most expensive supermarket once again at £573.15 for the 203-item list, £75.15 more than at Asda.
Both Aldi and Lidl were excluded from this analysis as they don’t stock many of the branded items to qualify as a larger shop.
