Toilets are always a problem area in schools. Whether they be separated or ‘mixed’
Many pupils do not want to use them, particularly when others are in. It was quite usual for pupils to need to go just after break or lunchtime. After a while of asking ‘why didn't you go at break’ I realised the problem and would let them go, telling them to blend in with the other stragglers.
My youngers and betters (smt) didn't always get this and, over the years, had total toilet bans in lesson time, toilet passes, passes for those with medical conditions etc.
To do this properly is far more than changing the stickers on doors.
It should involve knocking down walls, plumbing, new doors, new walls, cctv etc. And then new signs.
An ideal toilet is a single seater with a wash basin and its own floor to ceiling door out onto a corridor with cctv looking at the door.
Too many try do this on the cheap/can’t afford to do it properly.