Sorry, I can't really help you with the compound. My time in the Gulf flying Argosys really came to an end in October, 1971. Having said that, I then went on to fly the Belfast for a few years.
I made several flights to Sharjah between 1972 and 1976 resupplying the British Army Trials Team (BATT) at Sharjah. To the best of my recollection, they had taken over the old Trucial Oman Scouts (TOS) mess.