The answer is a nice school where kids get to go to the toilet and generally don't truant, vandalise or take drugs when doing so. I find the idea of not allowing them to use the toilet pretty weird.

I get your point that in some schools going to the toilet is a safeguardibg issue but as a young teenage girl I'd be absolutely mortified at having to get special permission from pastoral to deal with a period mishap, plus bleeding through can be avoided if you get to the toilet fast enough. Periods are still treated as embarrassing and gross - is the girl supposed to put her hand up and announce to the class she needs to go to medical for her period? How does this work in practice? I get where you're coming from and maybe in a school with such behavior issues there's no other way to do it, but still reckon you're too casual about how shit this policy is for girls.