UK supermarket food prices up by more than 25% in two years, says Which?

Which? said the absence of unit prices made it harder for Tesco shoppers to compare value for money between different sized packages, bottles and brands. Photograph: Paul Childs/Reuters

Supermarket food prices have increased by more than 25% over the past two years according to the consumer group Which?, with the size of the rise reinforcing the case for retailers to be forced to display detailed price information on loyalty card offers and promotions so shoppers can find the best deal.

Which? said the government needed to close loopholes that result in “confusing and inconsistent” pricing practices of some supermarkets. Last month it reported Tesco to the UK’s competition watchdog because it does not provide unit prices – such as the price for each 100g or 100ml – for the loyalty card offers it uses as a sales tactic to pull in shoppers.