Recently, a second Pret a Manger customer died from an allergic reaction, after eating a "super-veg rainbow flatbread" sandwich which was supposed to be dairy-free.
According to the British sandwich shop chain, Vegan brand CoYo, a coconut milk brand, had been "mis-sold to Pret" as "a guaranteed dairy-free yogurt that was found to contain dairy protein."
READ MORE: Pret a Manger's Inadequate Ingredient Labelling Led to Teenager's Death
"Subsequent testing by Pret and two independent authorities found that the CoYo dairy-free yogurt contained traces of dairy protein," the Pret a Manger spokesman added, as quoted by The Guardian.
Pret a Manger, a popular European chain of cafes, is already facing scrutiny over the death of teenager Natasha Ednan-Laperouse.