If BA had the aircraft, then one of the current terminators in Bangkok, Kuala Lumpur, or Singapore could be used, just like in the old days. Hard to think BA not too long ago served Perth, Adelaide, Brisbane, Melbourne, Auckland and Christchurch along with Sydney.
And then came Emirates, with SQ and CX ramping up their Aussie operations. The early day LHR flight from HKG has plenty of Aussie and Kiwi accents.