Grocery prices inflation reached a high of 17.1% last month, with food items such as milk, eggs and margarine seeing the fastest rises in price, according to new data from Kantar.

The market researcher estimated that the increase in food costs over the four weeks to 19 February would potentially add a further £811 a year to consumers’ shopping bills, The Times has reported.

A separate index published by the British Retail Consortium (BRC) and Nielsen IQ has shown that the pressure on consumers’ wallets is not limited to food items, with non-food inflation reaching a record 5.3% in February.

Helen Dickinson, chief executive of the BRC, said that the high price of energy and running costs for companies, as well as tougher trading conditions brought about by the war in Ukraine, have led retailers to push up prices, with the biggest rises for pet food and gardening tools.

Overall inflation in shop prices rose to 8.4% in February, up from 8% in January. The biggest rise was recorded in fresh food, which rose to 16.3%, up from 15.7% in January.

Fraser McKevitt, head of retail and consumer insight at Kantar, said: “This February marks a full year since monthly grocery inflation climbed above 4%. This is having a big impact on people’s lives.”