Memory further stirred re. Bevs - the Aden based Bevs had a run of engineering problems which left them with only one serviceable for some time. The callsign was MOBXG and it was soon after the change-over to the 'new' ICAO phonetics. One of my 'mates' who operated a lot on that aircraft 'modified' his callsign to MIKE OSCAR BLUNDERBUSS XMAS GURGLE and was happily contacted as 'Xmas Gurgle' for a while!