Thanks for detailed and interesting response.
I grew up in Scotland - a nice house, nice area, attended good school (local comprehensive) - I'd say the majority went on to higher education (this was late 90s). But the vast majority were the first in their families to go to uni. (I didn't realise it at the time but on reflection none of my peers at school had parents who were doctors, lawyers, high paid professionals.).
The vast majority of my school friends went to uni but almost all of us stayed at home and went to a local uni (3 unis in the city). Like a PP mentioned about her Scottish husband, I also had straight A grades (and went on to get a first class degree, Masters and PhD) but it never crossed my mind to go to a uni other than a local one (assuming I got a place - I did also apply to others). Financially it just wasn't feasible for my family. And my parents had no idea that there was any kind of hierarchy to universities.
At my local RG uni the vast majority of my fellow students were from backgrounds similar to myself. At the RG uni I did my Masters at, and the Uni I currently work at, the student population is very obviously much wealthier. In the tutorial group I teach, I had to stifle a laugh when all 12 of my first year students pulled out gleaming new Apple laptops in unison in our first session. It was like we were making an advert 😂 . (Whereas at home I have a 7 year old very slow laptop). That's just a small example but overall I just wouldn't fit in as a student there. The hobbies, holidays, clothes, tech....even topics of conversation 'where did you go to school?' - meaning which private school, not where are you from.