There are several one stop options available from EDI or GLA that would be better than BA's 2 stop options and having to make two transits:
EK GLA-DXB-BNE (possible to book with QF codeshare to earn avios/TPs)
EY EDI-AUH-BNE
QR EDI-DOH-BNE
Plus a few from MAN:
CX MAN-HKG-BNE
SQ MAN-SIN-BNE
Even more 2 stop options available avoiding LHR.
Highly recommend Cathay if travelling in Y. Had to travel last xmas in a rush and booked with them. Great timings of flights (from London at least) with a 10.30pm-ish arrival in Brisbane and 0.50 departure meaning full days there and a good night sleep on arrival. Went again in June with them and again, an excellent flight. Good food. Comfortable seats (18" wide) and decent IFE. Love HKG as a stopover in comparison to DXB which I hate. Have booked again for this xmas and are my back up for a September trip.
Cathay are also starting flights from Gatwick in September. Outbound is good, but inbound works best into Heathrow. Only 4 flights per week, but its on the new A350.