At Cranwell (although we were treated with equal contempt and wore the white flashes) we were referred to as 'Student Officer' whereas the direct entrants (even if they had degrees) were referred to as 'Officer Cadet'.
The non-commissioned UAS members were 'Cadet Pilots'. We wore hairy battle-dress with white flashes and a beret, with a white disk behind the badge.
We were on first name terms with our Flight Lieutenant QFIs, but the CFI was Sir and the CO was Sir or Boss.