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A study by Which? found that some items could cost up to a third more in convenience branches of the three major supermarkets

Customers buying milk at Tesco, Sainsbury's and Morrisons have been warned that they could be paying more depending on the location of their supermarket store. The tradition of popping to the shop for a bottle of milk could cost you more if you rely on smaller 'convenience' supermarkets, even if it's the same retailer.

Which? has compared the price of 42 everyday items at larger supermarkets and their smaller 'local' or 'Extra' convenience store equivalents from the same retailers

Sainsbury's, Tesco and Morrisons shoppers have been issued warnings over shopping for weekly essentials at convenience stores. Which?, a consumer watchdog, has warned convenience store shoppers over being overcharged for items.

Shoppers have been warned that they may be paying more for everyday items at supermarket convenience stores than they would at their bigger counterparts. Consumer champion Which? said: "We checked the cost of 42 branded and own-label products - from cheese and pasta to blueberries and ice cream - on three occasions in June and July.

Shoppers warned to avoid buying from smaller stores Some items are marked up as high as double the price at convenience stores compared

The findings come amid growing concerns about overuse of medicines in farm animals and rise of superbugs, with a damning report released today (Friday September 27).