RAFC became all-graduate early 70s.Unless something has changed, which is quite possible, those going to Cranwell from university hold Fg Off or in certain cases Flt Lt. Not confirmed until successful graduation. The days of the Cranwell cdts ended early 70s. They held various ranks as they progressed through Cranwell, Flt Cdt, Senior Flt Cdt, and for some Under Officer and for just one cdt, Senior Under Officer. The latter had an inverted chevron on the lower sleeve, thin braid for the UOs and thicker braid for the SUO, if I remember rightly.
Non-graduates (University type) went to Henlow as Offr Cdts.