German discounter Aldi has held its position as the cheapest supermarket in September for the second consecutive month after reclaiming the title in August.

According to the latest figures from consumer analyst group Which?, Aldi’s average shopping basket totalled £122.77, which was slightly lower than Lidl’s at £123.95.

This marks Aldi’s eighth win this year, after losing the title to Lidl in July. The research found that loyalty card members could have saved up to £830.44 in the past year by shopping at the discount retailer.

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Julie Ashfield, chief commercial officer at Aldi UK, said: “The latest Which? The report proves that Aldi is committed to keeping groceries high-quality and low-cost – because that’s what people really need. We’re proud to retain our title, helping shoppers save for life’s other essentials.”

Tesco, with a loyalty card, was the cheapest supermarket among traditional supermarket retailers, with a basket totalling £135.64.

Waitrose was the most expensive supermarket of the month, with an average price of £167.19, around 30.6% higher than Aldi’s average.

Average cost of items (September 2025)

• Aldi – £122.77
• Lidl – £123.95
• Tesco (with clubcard) – £135.64
• Asda – £136.98
• Tesco – £138.66
• Sainsbury’s (with loyalty card) – £138.74
• Morrisons (with loyalty card) – £140.19
• Morrisons- £140.24
• Sainsbury’s – £142.70
• Ocado – £154.08
• Waitrose – £167.19