https://www.bbc.co.uk/news/articles/c1kv8vxzn99o
'A UK-wide survey by Caerphilly-based company phs Group, external, in partnership with menstrual justice charity Irise International, found 65% of students were unable to access toilets at their school freely at any time.
Of these, 29% needed permission from a teacher to leave the classroom and 15% required a pass to be issued.
Of the 501 teachers who took part, 5% reported school toilets being locked at some point during the school day, including break times, with 4% saying they were shut all the time.
And16% said they had prevented a student who had periods from using the bathroom during class, with reasons including students wanting to skip lessons or meet friends.'
This is making school impossible for girls.
(It's the BBC, so they are carefully avoiding any mention of 'girls' - it's all 'students', neatly obscuring the issue that this affects females more than males.)