Three problems I have come across so far:
Uniform: Set or logo uniform not going up to bigger sizes. DD school sweaters go to 13 then it's a small adult which you have to pay VAT on.
Changing: Who child still changes in the classroom right the way up to Y6. I mean some Y6 are young women and having to change with the boys.
Sanitary bins: Yes primary school girl do have periods, very few a year I know, but they should be catered for. DD school only has then in the staff toilets.