Originally Posted by
omk298
Unfortuately the flights I want aren't available as a redemption ...
A quick look at QF award availability suggests that you should be able to get these two specific flights as an award in business class. I suspect that the problem is that the SYD-CHC is operated by Jetconnect, and awards on Jetconnect flights don't show up on ba.com. (There have been quite a few threads on this in the past, if you're interested in searching for the single word "Jetconnect".)
I would phone BAEC and ask whether you can get these as an award.