Camping Uk

My grandson (aged 10) is travelling to France on a camping holiday. He has a severe nut allergy to several nut types. Can anybody tell us if food over there has nut warnings, and offer any advice on travelling and eating in France for a person with allergies.
My grandson (aged 10) is travelling to France on a camping holiday. He has a severe nut allergy to several nut types. Can anybody tell us if food over there has nut warnings, and offer any advice on travelling and eating in France for a person with allergies. He always carries an epipen. Does anybody have any knowledge of french allergy labelling?