In a letter to Steve Barclay, Tanya Ednan-Laperouse and Emma Turay say there's currently no clear lines of accountability for overall NHS provision of allergy care.
Putney-based Tanya lost her daughter, Natasha, after she ate a bun from Pret A Manger which included sesame at Heathrow airport.
It's ahead of a debate in the commons on a petition which calls for a "champion for people with allergies".