Luckily we are free to send nuts and eggs to our kindy/school as I would really struggle with sending nice healthy lunches with a variety of foods while having to avoid nuts everyday.
Our school is pretty strict with everything else though, no packaged food at all (including tubs of yoghurt), no chocolate even if in a homemade muffin etc...
Also no white bread. Which I agree with, but sometimes if I am at the supermarket late at night there is nothing else left!
So then I have to send wholegrain crackers or something. A bit annoying.