The Food Standards Agency lead on this matter for government and from 13 December 2014 the allergen rules within the EU Food Information for Consumers Regulation became statutory. From this all food businesses, including school caterers, are required to make available the allergen ingredients information for the food and drink they serve. In these undertakings there should be processes in place to protect vulnerable individuals where the institution has a 'duty of care', for example in schools. In particular, school canteens have to ensure that children with a food hypersensitivity only get food served which is safe for them to eat.
Beyond this headteachers, school governors and their caterers are best placed to make decisions about their school food policies that take into account local circumstances. For instance, some schools are nut or peanut free which means that their caterers do not use nuts or peanuts as ingredients, and that all pupils parents are advised not to include nuts or peanuts in lunch boxes.