Unfortunately, the "foggy day rule" was only a myth.
We waited and hoped for years. One day it happened: We couldn't see Spike Island playing fields, let alone Salford University's Maxwell Hall. Most of the classrooms on the main building emptied, as the girls in classrooms overlooking the river made a break for it. We were blocked on both staircases by teachers coming out of 2 of the staff rooms, who told us that we were not, unfortunately, going to be allowed to go home.

I was in the penultimate year's intake.
It changed it's name to Cathedral High School, when it was joined with Sacred Heart School. Adelphi lost most of it's teachers, who left rather than be downgraded. (Adelphi lost it's Sixth form as part of the changes)
Many of them went to the Boys' Grammar school, who kept it's Sixth Form and didn't get joined to another school, into the bargain.
The boys got the better deal.
The teachers we got from the other school seemed flabbergasted that we were sat quietly. I think that they were more used to liontaming than teaching.
Children came over from the other school (we never went over there) We ended up having to carry everything we owned from class to class, as our girls learned the hard way we could no longer leave our coats in the cloakroom or our belongings in our desks. We dreaded days when we had to bring in our PE kit, plus our lab coat, plus our cookery stuff (and all our books, of course)
Culture shock, indeed!