I grew up in North London and at the time had a pretty good sense of the stereotypical boy from each of the above schools (and others). But things change, what would you say are today's equivalents?
For info back then they were:
UCS - creative, fun, bit druggy, good looking
Habs - Arrogant but brainy
CLS - Studious, more diverse than the North London schools
Westminster- very bright and unconventional (less conservative than St Paul's)
Highgate - Totally different school from today. Boys were typically more middle of the road.