Yes, the statistics look awful at first. But black students apply disproportionately for the most oversubscribed courses, which would explain it.
Oxford’s figures show 452 black students in 2009 achieving three A grades at A level (excluding General Studies) against 29,000 white students.
In 2009, the total number of black people admitted was actually 27, out of a total of 221 black applicants, an overall success rate of 12.2%. While this is considerably lower than the success rate for white students, it is higher than that of students of Pakistani or Bangladeshi origin.
Oxford argues that black pupils with three As are far more likely to apply than are white pupils of similar ability, and when they do apply they tend to pick the most oversubscribed subjects, where success rates are lower. 29% of black applicants in 2009 wanted to read medicine, where there are eight applicants for every place. Only 7% of white applicants applied to read medicine at Oxford. 44% of black applicants applied for Oxford's 3 most oversubscribed courses, against 17% of white applicants.
Chemistry admits 40% of applicants, Classics 45%, Geology 46.2%, Materials Science 44.5%, Theology 38.1%. But PPE admits only 18% of applicants, medicine 13.6%, and economics and management 8.9%.
David Lammy accuses Oxford of failing to reach out to black students, but last year nearly half of all black students who got three A grades applied to Oxford, against around 28% of comparable white students. So it's not really surprising that their success rate was lower.
I also found this:
"If black students really faced insuperable odds to get university places, you would expect only the exceptional to succeed, which would be reflected in a better performance in finals. But a study by the Higher Education Funding Council published earlier this year found that between 2002 and 2006 just 3.5 per cent of black students got first-class degrees, against 11 per cent of white students. Just over a third of black students (37 per cent) got a first or a 2:1, compared to 62 per cent of white students."
So it's not as simple as selecting a few statistics and accusing a university of racial discrimination. It's unlikely that almost every admissions tutor is a racist, and Oxbridge is making efforts to include students from all backgrounds.