Food businesses need to tell customers if any food they provide contain any of the listed allergens as an ingredient.
Consumers may be allergic or have intolerance to other ingredients, but only the 14 allergens are required to be declared as allergens by food law.
The 14 allergens are: celery, cereals containing gluten (such as wheat, barley and oats), crustaceans (such as prawns, crabs and lobsters), eggs, fish, lupin, milk, molluscs (such as mussels and oysters), mustard, peanuts, sesame, soybeans, sulphur dioxide and sulphites (if the sulphur dioxide and sulphites are at a concentration of more than ten parts per million) and tree nuts (such as almonds, hazelnuts, walnuts, brazil nuts, cashews, pecans, pistachios and macadamia nuts).
This also applies to additives, processing aids and any other substances which are present in the final product.

Allergens Code:

1 – Celery 
2 – Gluten / Wheat 
3 – Crustaceans 
4 – Eggs
5 – Fish 
6 – Lupin (Seed flour)
7 – Milk 
8 – Mollucs (Oysters, mussels, scallops)
9 – Mustard
10 – Tree nuts
11 – Peanuts
12 – Sesame
13 – Soya
14 – Sulphur Dioxide