Report with analysis of trends in higher education applications, admissions, and enrolments with break down by socio economic background.
Also information on gender gap in applications, applications by mature students and for part time study.
It includes analysis of the impact of fees on applications and admissions.
UCAS also provides official data on applications. The annual report has tables on acceptance by age, gender and ethnicity.
Higher Education Statistics Agency website provides free access to some basic data on enrolment and subjects from 1996 onwards. This also includes ethnicity, disability and gender.
For analysis and research try the Sutton Trust website which has many full text publications.
Use The Higher Education Empirical Research (HEER) database to trace references to articles and reports covering all aspects of HE.