The tabs would direct shoppers to homegrown food to help boost the economy and reduce the UK’s carbon footprint.
NFU President Minette Batters said: “We have been asking retailers to commit to signposting British produce for a number of years, so it’s great to see MPs and their constituents getting behind the idea of a ‘buy British tab’ online.
“We know from our own independent survey that 86% of the public want to buy more British food, but it is often tricky to determine what products are produced in the UK and this simple change would help shoppers do that.”
The letter was signed by MPs including Luke Evans, Theresa Villiers, Philip Dunne and Graham Stuart.
Evans added: “The public want to know more about where their food comes from and how it's produced... but this easy signposting doesn’t currently exist. Buying British is good for local food producers, good for the environment and good for consumer choice. It’s a win all round.”