Ttn Tim Jones I also knew - I was seconded to Oman from '73 to '75.
Tim was one of the few (the only?) Rock who was seconded to SAF as an infanteer; there were of course many Rocks - as Rocks - at Salalah mostly manning the "Hedgehogs" IIRC.
You will be aware that the Omani campaign medals and the GSM Dhofar clasp were an "either or"; seconded - wearing Sultan's uniform - no GSM clasp.
Although I do know of some fairly senior ex-secondees who seem to have "acquired" a Dhofar clap to their GSMs........ (and no - it wasn't Jock S!)