OK I remember these:
. If you had PE last period, you had to get changed before leaving. For two years (before I moved to the next village), I lived ten minute walk from high school to home. I wasn't going to get changed into uniform for me to get changed 10-15 mins later. Behind the mobile changing rooms, there was a gap between hedge and fence which brought you onto the road. Myself and a few who lived a similar distance to me (though in different directions) used to sneak off behind the changing rooms.
, One way system. This was to prevent fights in a couple of corridors. For about 6 weeks I was on crutches and twice a week I had a lesson in one classroom and then in another classroom, which was the furthest away in the one way system. I wasn't allowed to hobble in the opposite direction. I had to go around the entire school.
. If unable to do PE, had to stand outside (if class was doing outside PE). Not allowed a chair or stool to sit on when I had crutches. Wasn't allowed a coat either. Why? Fortunately both PE sessions were last period and my parents took me home after the previous lesson. Why couldn't I sit in the library as that was manned all the time.
. Toilets assigned to different year groups. No idea why that happened. I had very very heavy periods during this time and had a night time pad I had to change every 1-2 hours. I had to visit the loos for whatever year group I was in at the time, going around the one way system and got a rollocking from the teachers for being late.
I went to this school 92-95 for info.