Apparently 48% of students come from London and the South-East with Richmond being a particular hotspot. Should we be surprised by this and accuse the universities of bias? The way I see it is Richmond is full of extremely intelligent people who presumably have intelligent children. They then have the money and resources to support them in all sorts of ways, such as buying books, reading to them, private schooling and/or tutors when needed, sport and other activities.
I really don't see how this is the fault of the universities.