This year I heard (from someone who gave them a mock interview in which they did quite well) of a very able black candidate who didn't get a place at Oxford. They ticked all the right boxes academically so were interviewed but then turned down. Oxford need a very bright spotlight on their admissions and a cut in their funding until they agree to it.
So if the very able black candidate did significantly worse in interviews and admissions tests than other candidates, including white or other minority candidates from deprived backgrounds, should they still get a place just because they are black? Just because your acquaintance thought they did quite well in a mock interview, does this really mean that they deserved a place?
I have also given mock interviews to candidates who did well and who didn't end up getting places: with 5 or so applications for every place, it's inevitable that strong applicants are going to be turned down.
I was surprised to read that grammar school pupils had a lower success rate is applying to Oxbridge than Independent schools. if admissions were fair then that would not be the case.
Why? Grammar schools are often not good at judging who to put forward to Oxbridge: I have seen many applications which are really not competitive and which don't make the first cut. There is also the elephant in the room: students with the same (top) A level grades don't perform the same in higher level assessment tests. Sadly many state schools don't push their brightest students to have a deep and broad enough understanding of their subjects. It's very hard to correct for this in admissions i.e. to take into account that candidates are working at a lower level because they haven't taught deeply enough.
I have no problems with top universities being put into the spotlight about admissions procedures, but one has to look very carefully and deeply into what is going on, rather than rushing to superficial judgements. (The study quoted in the first post is pretty much irrelevant as personal statements won't be a very big factor in almost all university courses in getting interviews/offers.)