A serious risk may arise if a supplier has substituted one product for a similar one. This may happen when the usual manufacturer of a dessert, for example, has run out of stock and the supplier sends a substitute of similar quality, which may even look similar.
The key message is: Set up a system for checking that the ingredients information for the product you are using matches the actual food you are handling.
Sally and her friends went out to the local branch of a chain restaurant for a meal. After the main course, she was choosing a dessert and asked the waiter whether the strawberry gateau contained nuts. She explained that she had a nut allergy.
The waiter came back saying he had checked the ingredients and the gateau contained no nuts. Sally took one bite and thought it tasted nutty. She asked staff to double check and they realised that the waiter had taken note of the ingredients of the gateau usually ordered but that on this occasion a substitute had been sent by the supplier. The ingredients of the substitute gateau listed nut crumb. Sally ended up in hospital.