Here's an excerpt from the Food Standards agency website:
People with some food allergies, particularly peanut allergy, have to be extremely careful what they eat. Food labelling is very important to these people because the consequences of eating the food they are allergic to could be very serious.
What's bothering me is the phrase "particularly peanut allergy". Why particularly peanut allergy? Surely ingesting any allergen could be very serious. DS is allergic to peanuts, but would be equally ill if he ate traces of milk, eggs or sesame.