The R.A.F. re-introduced N.C.O. pilots (and navs) in the early 60's. There were 4 sergeant pilots on the same course as I was at 5 F.T.S. Oakington (Varsities) at the beginning of '64, one of whom was then on the same Shack course as me. To my knowledge 2 of them were still N.C.O.s as late as '68. I believe they were all commisioned shortly afterwards.
I think the " sunshine " issue had something to do with it, as Coastal Command's sunshine was supplied by the septics.