...I believe Air UK had G-UK + a director's initials...
Just have to correct you a bit, Mr. c52...
I was at Air UK at the time and never did find out who was the crawler who sucked up to the directors!!
G-UKJF - Jim French, went on to Flybe.
G-CHSR - Helmut Schmidt-Reps, our liaison bod with KLM, despite actually being German.
G-CSJH - Stephen Hanscombe, our MD. Went on to 'consulting'.
G-UKSC - Finance Director Stuart Carson. Went to Flybe before retiring.
G-UKPC - Dear old Phil Chapman, aviation bod through and through.
G-UKHP - Harold Payne, Dir. of Engineering.
G-UKRH - named after our accounts dept at Crawley (KRH).
G-UKLN - Len Nutter, can't remember what he did.
G-UKRC - Robert Coleman, Customer Services chap.
G-UKAG - MD Andrew Gray who succeeded SJH.
G-UKAC - Director/'Chief Pilot/Holder of AOC Alan Cottle.
G-UKID - ???
G-CNMF - ???
Air UK Leisure behaved themselves and just used G-UKL...
Ah, those were the days...