In 1966 Gulf had no aspirations towards jets. Inventions of the devil that lost money, was Alan Bodger's - correct - view. I don't think even the F27s had arrived at that time. Alan liked those, but not as much as the beloved DC3s, which really did earn money.
This only changed when Abu Dhabi and Oman joined the shareholders and wanted something slightly more prestigious. The BAC trials aircraft at Bait was one of the ones that Gulf bought, -400s ex the Phillipines as I recall but maybe that's wrong.
Brakedwell...sorry, I haven't a clue who was flying that day. Some of the Gulf Captains, converting from F27 and just back from the type course, were there and took some part in it, especially showing the BAC pilots the way along the approach. I think 'Fingers' Barnard was one of them.