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The most expensive supermarket is a whopping £70 more than the cheapest (Image: Getty)
One UK supermarket is costing you £70 more than the cheapest, new research reveals.
The UK’s cheapest supermarket for the seventh month in a row is Aldi, as found by analysis of grocery shopping prices by consumer outlet Which?
This month’s findings illustrated that a shopping trolley at the budget retailer is a full £68.90 cheaper than one at Waitrose – which ranked as the most expensive.
However, the bargain supermarket was only £2.65 cheaper than its nearest competitor Lidl.
Which? uses a basket of 93 popular branded and own-label products for their tests.
It includes essential products such as as milk, bread, beans, potatoes and cheese – but the full list is never revealed to avoid shops reducing prices specifically to look lower-cost in the monthly rankings.
Aldi was ranked the cheapest supermarket (Image: Getty)
The list came to an average price of £158.05 at Aldi in July, compared to £160.75 at Lidl.
Asda, Sainsbury’s and Tesco then make up the rest of the top five, with under £3 separating them.
However, the use of loyalty cards at these stores makes a huge difference, with up to £10 being added to those supermarkets’ costs if they are not used.
Which? data suggests an average saving across a month of up to five per cent if a loyalty card, such as a Nectar card or Clubcard, is used.
However, earlier research suggested that millions of shoppers are excluded from loyalty schemes due to factors such as lacking digital access to sign up, not having fixed UK addresses to register to or being aged under 18.
Waitrose came in as the most expensive (Image: Getty)
Without the contribution of loyalty cards, Morrisons comes in cheaper than Tesco and Sainsbury’s.
The remainder of the list if formed by Ocado (£209.40) and Waitrose (£226.95).
Which? also releases a monthly ranking of just branded goods, that does not include Lidl and Aldi.
In June, Asda came out the cheapest in this category.
Sainsbury’s was the most expensive for a fully branded shop if a Nectar card wasn’t used, more than 15 per cent more expensive than Asda.
If a Nectar card was used it was only 3.74 per cent more expensive, with Morrisons (4.39 per cent), Waitrose (11.28 per cent) and Tesco without a Clubcard (14.26 per cent) above Asda’s prices.
Data suggests that the average household spent £5,530 on groceries over the 12 months to July 2026 – up £156 against the same period last year.
