The cheapest supermarket for September has been revealed with shoppers paying on average 27 percent less than the most expensive retailer.

Consumer champions Which? bought 59 everyday essentials from supermarket giants including Aldi, Lidl, Asda, Tesco, Sainsbury’s, Waitrose, Ocado and Morrisons to determine the results.

The group found Aldi to be the cheapest supermarket in the UK beating Lidl again to the title. Aldi’s total cost of the 52 items came to £102.68 with items including bread, milk and butter.

Food items were both branded and non-branded to ensure fairness across the research with special offers and loyalty schemes also included but not multibuys.

Meanwhile, Lidl’s costs came to £103.86, which was £1.18 more than first spot Aldi, with Waitrose being the most expensive supermarket.

Overall, Waitrose’s 52 items came to a staggering £130.37 on average, £27.69 more than Aldi.

Ele Clark, retail editor at Which? said: “Our latest monthly analysis once again sees Aldi crowned as the UK’s cheapest supermarket. Given the ongoing strain of high food prices on household budgets, it’s understandable many people are choosing discounters to cut costs.

“By switching supermarkets, consumers could save 21 percent, highlighting the advantages of shopping around.”

Research also found that Tesco Clubcard members could pay on average £112.96 and those without a Clubcard would pay slightly more at £113.35.

Sainsbury’s customers who have a Nectar card could see them pay £113.79 on average and those without the scheme would set them back £119.19.

It comes as Aldi was named as the cheapest supermarket in the UK in August. Which? found 62 food items would cost on average £110.58. Yet again Lidl was second with the same basket of goods costing customers £1.30 more using their Plus scheme at £111.88 and £112.17 without.

Waitrose was again the most expensive supermarket in August with 62 everyday essentials totalling £140.89.