I see what you mean re people being more accepting around the middle of the century.
However, when you say crushes on girls were seen as normal & not indicative of orientation in future: is this really evidence of lesbian acceptance?
If at your school someone had turned out in later school years to be lesbian/having a gf rather than simply having girl crushes, would people not have had issues with that?
Maybe I'm wrong, but hasn't it historically been the way in girls' schools that girl crushes were fine precisely BECAUSE most people had them, and bc they were thus seen as an adolescent stage to heterosexuality, but girls who had relationships with girls/turned out to be lesbian were certainly not accepted at schools in the same way?
I get that most UK older women haven't been very fazed by lesbians, certainly not how men reacted to gay men often. But isn't the fact that lesbians 'just didn't feature' to most women in itself indicative of the way that lesbianism was generally disregarded as it was often disbelieved that women could have serious attractions that didn't involve men at all?
Invisibility & disregard are obvs better than violent persecution, but they're not the same as acceptance, are they?