Asda was the cheapest supermarket for our comparison basket of goods by almost £20, in October.
For the last month Asda charged on average £177.45 for our basket – which included 90 branded products, such as Tetley tea bags and Ribena.
In contrast, Waitrose was on average £19.06 more expensive, over the course of the month.
Each month we add up the average cost of between 80 and 100 branded products at the online supermarkets Asda, Ocado, Sainsbury’s, Tesco and Waitrose. We include special offer discounts but not multibuys.
To find out how the supermarkets have ranked over the past year Which? members can log in to our supermarket prices compared page. To calculate the price of our comparison basket we used data from the independent shopping website Mysupermarket.
Food inflation is at its lowest since 2006, according to the British Retail Consortium (BRC) and Nielsen, standing at 0.1% in October.
The BRC said that milk, cheese, eggs, vegetables and convenience food were all cheaper than a year ago – so shoppers may get bargains as Christmas approaches.
Aldi, Lidl and Waitrose all continued to see increased sales, according to market research firm Kantar Worldpanel, while Tesco, Sainsbury’s and Morrisons all saw sales slip a little. Discover which companies have been voted the best and worst supermarket in our supermarkets review – which is based on the views of more than 10,000 people.
Supermarket price comparison schemes
Tesco, Asda, Sainsbury’s and Ocado all have price comparison schemes. This is where they compare your shopping with prices in other supermarkets. If parts or all of your shopping would have been cheaper at another supermarket you may be offered a voucher for the difference.
However, the supermarkets they check against, the products they include and the terms can differ. For example, Asda gives you a voucher if your shopping isn’t 10% cheaper, Sainsbury’s only compares branded products and Ocado only checks against Tesco.
Waitrose price matches Tesco on branded items and this is included in our monthly price comparison.