Thanks for your responses guys
My mistake - yes - its economy I am after - will look at the JNB option as I had an AONE5 ticketed from there earlier this year which came in cheap, and sadly I had to cancel!

Will also have a look at the KLM/Air NZ option - see what they can throw up

I guess my other goal is maximising what I can get out of the deal - I know if I do another return LHR-SYD with Etihad I can get lounge access on the way back, but I dont think that I'd get enough miles with QF/BA to make much of a difference to my tiny miles balance?! If I can get something extra to make future flying between LHR-SYD more pleasurable, that'd be my goal I guess!

Thanks