Waitrose posted the highest grocery price inflation of all the major supermarkets last quarter, according to analysis by UBS.
Averaged over the three months to July, the cost of a basket of groceries at Waitrose rose by 3.6 per cent.
This compared to a year-on-year rise of 3.2 per cent at Sainsbury’s, which increased its prices by the second-highest amount in the quarter.
Across all the supermarkets analysed, UBS found the average inflation in the quarter was 2.5 per cent.
Price inflation at Tesco jumped from 1.8 per cent in June to 4.1 per cent in July, which UBS said might show the supermarket is shifting to rebuilding its margins.
Waitrose said that its own analysis showed its inflation was in line with the market.
A Sainsbury’s spokesperson said: “The cost of individual products is determined by a number of factors and prices can fluctuate as a consequence, going down as well as up.
“We remain committed to providing our customers with great quality and value every time they shop with us.”
The grocery inflation in July was far higher than the three month average. The average for the supermarkets was 3.8 per cent.
Prices have been rising in supermarkets since February this year, according to the British Retail Consortium (BRC), due to the rise in sterling following the Brexit vote.