Consumer group Which? has found Aldi to offer the lowest prices on 93 everyday groceries in the month of July, besting Lidl and Asda.

It’s the seventh month in a row that Aldi has taken the top spot, with the Which? shopping list costing £158.05 on average across the month.

Meanwhile, in the loyalty price battle between Sainsbury’s and Tesco, Nectar card once again offered cheaper prices for the chosen items when compared to Tesco deals with a Clubcard.

Which? found that having a loyalty card would save an average of 3.6 per cent at Tesco and 5 per cent at Sainsbury’s over the month.

There were 48 loyalty discounts overall in July: 25 at Sainsbury’s and 23 at Tesco. There were no loyalty discounts at Lidl, Morrisons or Waitrose for the Which? list in July.

“The discounts offered by loyalty cards may sound good, but that’s only if you can access them,” said Ruby Flanagan, senior content producer at Which?

“Our research has found that millions of people can’t access loyalty promotions because they aren’t eligible to join the supermarket schemes due to their age, lack of address or difficulties with digital access.”

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Which? checked the prices of both popular branded items and own-brand groceries at eight of the UK’s biggest supermarkets throughout July to see how they compared.

The shopping list included milk, cheese and Hovis sliced bread.

Aldi once again secured the title of the cheapest supermarket in July, with an average price of £158.05 for our list. Lidl came second, with an average price of £160.70 – a difference of £2.65.

Asda was next, items costing £185.81 on average.

Waitrose was again the most expensive supermarket in the monthly analysis, with the items on the list costing £226.95 on average throughout July. This is a difference of £68.90 on average, or 44 per cent compared with Aldi.