The secret shopping expeditions, all conducted before Christmas on the 19th December, found that Sainsbury's, Morrisons and Lidl are all currently stocking free range eggs from Holland, France or Germany.
"It's important to our customers that they know where their food comes from, that's why we pledge to sell British free range eggs as opposed to foreign imports in all ASDA stores," said Sian Horner, press manager at Asda.
Asda now only stocks free range eggs from the UK displaying the lion mark for food safety and welfare standards, which is not always displayed on foreign imports.
A spokesperson for Sainsbury's told FoodandDrinkEurope.com before Christmas that the store did not stock foreign free range eggs. Officials were unavailable for comment on the secret shopper findings at the time of publish.
Somerfield are stocking 40 per cent free range eggs sourced from Northern France due to a shortfall in supply from British producers. This is only a temporary measure until demand could be met, a spokesperson told FoodandDrinkEurope.com.
Morrisons are also stocking foreign Dutch free range eggs due to the same shortfall in supply. However, these are all clearly labeled in the country of origin and are approved to the KAT standard, which offers a high degree of traceability back to the egg producer.
Despite calling the campaign an industry leading move, both Waitrose and Marks and Spencer already stock only British sourced eggs.