Of the 21 who were commissioned on my OCTU course at Feltwell in December 1964, 11 had come through the ranks. I think we started around 28, but several direct entrants got chopped along the way.
We were all destined for ground branches, the figures would have been a lot different at ITS at South Cerney where I should think around 80 - 90 % would be direct entrants, all aircrew hopefuls.