Welcome to FT tindalm. ^
I am not really the expert in burning miles and I am sure someone else will be along shortly.
However normally we consider on this board that the best use of miles is to pay for World Traveller Plus (BA's premium economy) and upgrade to Club World (BA's business class), which will be 25k miles each way (50k miles return) to Oz.
It is also stated regularly that redemption seats to Australia in CW are jolly hard to find.
Last edited by Sixth Freedom; May 25, 2011 at 1:10 pm