Pret sandwich linked to fatal allergic reaction contained milk, expert says

Celia Marsh had an acute dairy allergy (Leigh Day/PA)

A chemist who analysed a Pret a Manger sandwich believed to have triggered a dairy allergy in a 42-year-old woman says he believes the product contained milk, despite the level being too low to measure with any degree of accuracy.

Celia Marsh went into anaphylactic shock on the afternoon of December 27, 2017 shortly after eating a super-veg rainbow flatbread, and was pronounced dead less than two hours later.