The parents of a teenager from Fulham who died after an allergic reaction to a baguette from Pret a Manger are hoping to "make food allergies history" with a ground-breaking trial.

The aim's to build up a tolerance to certain foods by gradually exposing people to it, under clinical supervision.

Natasha Ednan-Laperouse died in 2016 after a severe reaction to sesame.

Her mum Tanya says their campaign to improve food labelling was just the first step.