So why not monitor the child (if any) with the nut allergy? That would allow other children to continue eating nuts as they wished.

Think about it logically. Schools are under funded as it is, their budget does not run to having someone to spend all break times with allergy sufferers to make sure they don't eat nuts. I would rather paid helpers are paid to sit in classrooms and support less able children to read and write.

Then as pointed out above nut allergy is particularly nasty as it can be triggered by just being in close proximity to someone who has eaten nuts. There is no way to monitor who a child comes into contact with from 9.00 to 3.15.

Bunna you make the assumption that all 11 year old children have the same powers of intellect and reasoning. They don't. But they shouldn't be excluded from education because of it. And their school has a responsibility to ensure their safety.