Warning issued over buying Christmas dinner at Lidl, Tesco, Sainsbury's, Waitrose

A warning has been issued over buying Christmas dinner at a string of popular supermarkets. The cheapest supermarket for a Christmas dinner has been revealed as we head through December and further towards the big day itself.

Which? found Aldi to be the most affordable place last month for groceries out of the eight biggest supermarkets in the UK. Which? looked at how the retailer's prices compared to a shopping list of 55 products, to represent a weekly shop.

The cheapest supermarket for a shopping list of 55 items was Aldi, which is rivalled by other supermarkets like Lidl, where the groceries cost £97.89 on average across the month. Lidl cost only 38p more with the supermarket’s loyalty scheme Lidl Plus and 45p more without.

READ MORE UK faces 'horror' 340-mile snow bomb that'll 'explode' over England this weekend

Tesco shops cost £105, with Sainsbury's at £106, but the supermarkets rose in price to £108 and £112 without a Clubcard or Nectar card. At Asda a basket cost £108, with Morrisons priced at £111 and Ocado and Waitrose even more expensive.

Harry Rose, editor of Which? magazine said with Christmas just around the corner, people are looking to cut costs where they can. Our analysis shows that by switching supermarkets consumers could save up to 21% highlighting the advantages of shopping around where possible."

Which? explained: "We can’t include the value of points, personalised discounts or other rewards as these vary from customer to customer. Products on our list include everything from Heinz baked beans and Mr Kipling cakes to own-label milk, bread and cheese.

"Our data is supplied by an independent price comparison company. For stores that don't have online prices we send fieldworkers out to gather prices. The master list of 200 products is currently updated annually but otherwise remains constant. However, the specific products chosen from the master list vary from month to month depending on availability. This means the totals aren't comparable between months or years."