Thanks
Ametyst1. That is exactly what I did yesterday and got nowhere. I have tried it again today and found nothing on the days needed and nothing helpful on other days! Given the route has so many seats on it, I am surprised that they do not have some availability. On the other hand, BA make a point of not having reward flights when they are wanted, so QF might have the same approach!
Last night BA kindly offered a routing from SYD to HKG to BNE to SIN to PER, four flights taking 42 hours. Not sure how the BA computer thinks that is a good answer.