This thread still attracts attention and yesterday on another website for WW2 history a veteran of the conflict was the topic, Arthur Robert BROCKLEHURST, a UK contract officer who served in Oman for ten years. I don't think the references found have appeared here before.

The London Gazette on 29/9/1959 refers to:
Short Serv. Commit. 2nd Lt. Arthur Robert BROCKLEHURST (458614) from Reg. Army, Nat. Serv. List, to be 2nd Lt., 29th Aug. 1959
From: https://www.thegazette.co.uk/London/.../6127/data.pdf

He was a company commander (with Red Company, NFR) in 1966, when there was an attempt to assassinate the (old) Sultan. See: http://www.jepeterson.net/sitebuild...1966_Assassination_Attempt_on_Sultan_S aid.pdf

He did adapt well when in Oman:
British officers were primary targets to the enemy insurgents, but despite their height and pale skin, some would blend in quite well. Many of the officers within the Sultan’s army, after a deepening tan and a closely cropped beard, became unrecognizable to the foreigner’s eye. On one occurrence when a senior British officer attempted to talk to one of the Sultan’s soldiers in his practiced Arabic, the soldier responded in Arabic to his questions. It was not until later that the visiting dignitary realized that he was talking to Arthur Brocklehurst, the British Regimental second in command.
From a 2009 US Army Masters thesis: https://apps.dtic.mil/sti/pdfs/ADA513085.pdf

There are eight references to him being interviewed in 1981, in Oman, when he commanded the Northern Frontier Regiment (NFR) by a British Army officer for a Cambridge Masters thesis. See: http://www.55fstramc.com/wp-content..._War_McKeown/Dhofar-War-John-McKeown-Full.pdf

There is a photo of him alongside his C.O. in Oman, Bryan Ray, in the later's book on his time in Somalia and Oman. See: https://www.amazon.co.uk/Dangerous-F.../dp/B00911RU1Q and parts are available on: https://www.google.co.uk/books/edit...ehurst"+++"oman"&pg=PT119&printsec=frontcov er

Some context is available in this document: https://www.sant.ox.ac.uk/sites/defa...collection.pdf

The opening post refers to:
Apart from this I have found very little information though I was told he committed suicide not long after leaving the army.
One book author, Ian Gardiner, 'In The Service of the Sultan' refers in the acknowledgements to:
owes much to my recollection of long conversations with the late Arthur Brocklehurst who had a deep and abiding interest in Oman
From: https://www.google.co.uk/books/edit...lehurst"+++"oman"&pg=PP13&printsec=frontcov er