My eldest son is in year 8 at a large academy. Whenever it rains he comes home with most of his packed lunch uneaten. He says that people with a packed lunch have to eat outside everyday. If it is raining or has recently rained there is nowhere dry to sit.
I have suggested that he politely tell someone at school about this. I think that the staff may not realize that this is a problem and a solution could easily be found. I am guessing that the lunch staff and cleaners do not want to be cleaning up after the packed lunch pupils as well as cleaning up the canteen. I wondered if they could eat in an empty home economics class room where there will be cloths and a dust pan and brush to clean up after themselves.
I know I am being very PFB but I think that a dry place to sit and eat is a fairly basic requirement. My son has some SN and is reluctant to speak to anyone.