"Wayoutwest"
When Gulf Air took delivery of their Standard VC-10s from BOAC/BA they did indeed use BA instructors both F/Es and Pilots to train their crew who came from every operator of the VC-10.
After base training at least some BA F/Es were used to operate the route initially , but it was so enjoyable that you had to be quite senior to get the chance.
If we are talking about postings then Sydney was a very traditional place for BOAC posting as Comet 4s and then I believe the B707 had postings there.
Also whilst in that part of the world we better remind everybody that Concorde used to have a posting in Singapore.