East London Coroner’s Court heard that on the day of her death neither Hannah or her mother were carrying an epi-pen that had been prescribed.
Hannah and her mother visited the Costa Coffee branch in Station Parade, Barking, owned and operated by a franchisee, to buy two soya hot chocolates before Hannah attended the dentist.
Barista Urmi Akter previously said she took the order from Ms Duyile and said she had repeated the mother’s request that a jug be washed out, and pointed out hot chocolate is made from milk.
The inquest also heard that, at the time of Hannah’s death, allergen training for new Costa staff involved a series of online modules that could be accessed at home and a quiz that trainees had to pass.
A post-mortem examination found Hannah died after suffering from a hypersensitive anaphylactic reaction triggered by an ingredient in her hot chocolate that caused an allergic response.
Dr Radcliffe said: “The root cause of this death is a failure to follow the processes in place to discuss allergies combined with a failure of communication between the mother and the barista.”
