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Give "Travelbag" a call - not sure of their web address but I bought my ticket to Oz when I headed over there last year and saved myself a small fortune...
Travelbag are pretty good. Also try http://www.tcdirect.net/
They are quoting approx £700 at the moment which is pretty good as you are approaching peak season. Also, if you can string it out until after the World Cup Final, you should find prices come down a bit.