Rex Banner - I was told by a friend (who completed OAA integrated last year) that that is OAA's criteria for putting forward prospective BA cadets, i.e. top 5 in class regularly. I will, however stand corrected.
BA only take low houred guys from integrated courses only as they have had significant numbers of training failures from modular candidates. As Clanger 32 said, it also allows them to cut down on numbers. I fear how many letters BA must get saying "i wanna be a piiiilotttt"