Still the most usual route for progression to undergraduate studies at university are General Certificate of Education Advanced Levels (A levels). The minimum requirement is normally two A level passes, but most universities, through their faculties or departments, stipulate a specific minimum number of points which must be gained to secure a place, which are calculated on the basis of the A level grades achieved. The number of points required will differ from subject to subject, depending upon the demand for places. Places for which there is a high level of competition, such as medicine, will normally require a higher point score than those which consistently under‐recruit. As well as the A level route, most universities accept alternative entry qualifications for adult students, such as the Access to Higher Education qualification. The Open University, as its name suggests, accepts students with no formal entry qualifications. See also Access course.
http://www.ucas.com/students/ucas_tariff/tarifftables Gives point scores for a range of national qualifications, including A levels.