Hi Nassu,
I made a risk assessment for contamination with allergens from food from employees. probability low, severity high; we have several rules in our hygiene rules, like eating only allowed in canteen, without wearing working clothes, handwashing mandatory after eating. because each meal contains between 2-6 official EU allergens, depending on what someone will eat, we don't do any discrimination between the types of allergens they can bring to the canteen to eat. there is always a question from UK customers if they are allowed to bring products with nuts, but my answer is always yes, because otherwise I have to forbid bread, yoghurt, eggs, and then we don't have what to eat anymore (I know that they cause different reactions in different ways of contamination, but still as long as everybody complies with the rules, they can all eat whatever they want)