POSSIBLY G-AHKU (cn 6810) BEA's "Islander" class "RMA Cecil John Rhodes" at St Just whilst operating the schedule to the Scilly Islands. Ordered for RAF as NR722. Flown by BEA from 06.46 until sale in 05.64.
Have had a look. Didn't know any others, but I'm certain that it is Graham Giles (not Horace) because he used to play cricket for St. Just 1st team, ? as a fast bowler. Cheers.