The UK supermarket with the fastest-rising prices has been revealed in a new consumer study. Which? revealed food inflation broken down by range and supermarket. The consumer group has an inflation tracker that reveals exactly how prices are being affected in British supermarkets, helping consumers plan and prepare, as well as choose where to go for their weekly shop. Overall, the annual inflation for supermarket food and drink in its tracker has started to drop, to 4.1% in the three months to the end of February 2026.

This is a drop from 4.7% in December, 5.4% in August and 4.6% in May, and significantly lower than its peak of 17% in the three months to the end of April 2023. The group’s latest figures show that products at one British supermarket have the highest levels of inflation, with prices up 4.7% year-on-year in the month of February, and it’s not any of the big four (Tesco, Aldi, Sainsbury’s and Asda).

The supermarket with the fastest-growing prices is Waitrose, according to the group’s latest data. However, inflation is a measure of how quickly prices are rising or falling and not of the absolute price, so the supermarkets with the highest rate of inflation can still be cheaper than many others.

The study also identified the food and drink items that have seen the highest rate of inflation, with chocolate taking the lead with 11.8%.

That is followed by fish, energy drinks, meat, and chilled ready meals.

After Waitrose, the supermarket with the second-highest rate of inflation was Lidl. In third place is Tesco, followed by Sainsbury’s, Morrisons, Asda, Ocado and Aldi.

The experts at Which? pointed to a number of reasons for food price inflation. For example, prices for fertiliser and fuel have increased, which eventually has a knock-on effect on the price of many things on supermarket shelves.

Although Waitrose has the highest rate of inflation in the Which? study, that doesn’t mean it is the most expensive supermarket to shop at. In fact, in a separate study by the same consumer group, shopping for branded items in Waitrose was revealed to be cheaper than the same shopping in Tesco and Sainsbury’s without using a Clubcard or Nectar Card.