Coff: from the NAO report on Mil Flying Training (12 Jun 15):
1.4 Currently, around 250 UK aircrew (150 pilots and 100 rear-crew) begin training. Trainee aircrew may be direct officer recruits, selected serving officers, senior non-commissioned officers or, in the Army, selected non-commissioned officers. 2
so the 230 looks to be the total number of all aircrew, front end & rear crew, which makes the students per ac ratio marginally better although the rear crew trades still need to go in one sometimes.