I felt that people viewed college as a more "elite" thing in the UK than in the US. In the US, when people say they couldn't afford to go to college we know they just don't want to go. There is financial aid, there are community colleges that award lower degrees, etc. You don't even need to have taken the SATs to get into these community colleges--they are basically grades 13 and 14 (US school ends at grade 12) but at least you can gain some skills. And there are universities that will take an 800 SAT score (out of 1600...sorry don't know the new scale since they changed it).
I go to Stanford, and nearly all of my friends (including myself) have part-time jobs. Most of these are relaxed on campus jobs in offices, but still...it is considered normal to work for extra income as a student. I actually don't need the money, but I prefer not to ask my parents for $$ so I have a job. At the equivalent universities in the UK (Oxbridge, LSE, UCL, etc.) barely anyone works! I was at Oxford for 6 months and with the exception of the few students who worked in the Magdalen bar there was almost no employment. That makes it more elite because a poorer student who needs to work will have a hard time doing so. The lecturers aren't trying to accommodate you if you need to work during the week. In the US, there is a form of federal financial aid called work-study that actually requires students to work as part of the plan, so the universities have to be understanding.
So in terms of social class and income level...I think top universities in the UK are more elite than top universities in the US. Which is funny given how much cheaper it is to attend university in the UK on paper.