Melbourne and Honolulu postings have already been mentioned. There was also a Hong Kong posting in the 1960s. The postings lasted about 3 months.
The last postings to go were the Sydney postings in the 1990s. The 747-400 took over the route from the 747 Classics. Correct me if I am wrong but I seem to remember there were just not enough volunteers from the 747-400 pilots and the Sydney base closed. For the 747-Classic guys they would come back with some very good allowances saved and the posting was popular, especially in the UK winter. The 747-400 pilots were making very good money on long range payments at the time and for them there was no financial incentive to stay in Sydney for 3 months.