£700 sounds pretty expensive (supposing your talking freight by sea). We paid about 450 euros Sydney to Helsinki, plus 150 at the receiving end (this 150 was a bit of a rip-off, dont know if you can collect it cheaper in Oz). Was supposed to take 42 days, but in reality it took around 60.
Out of curiosity, which company offers a ´roll on roll off´ service between UK and Oz, on what kind of ship, and is that service a regular one?
If youre sensitive about scratches, etc. when transporting, then a closed crate will be the best.