Originally Posted by
Dave Noble
You can do it, but the fare will be that of a business class return unless you buy an open Jaw
an open jaw GLA-SYD / DXB-LHR in business class plus
MEL-DXB in economy class one way
This is likely to be more expensive than buying business class the whole way
Another option, but probably would require calling, is to book it as a multiy city circle trip, the issue there being that it will look at MEL-DXB-LHR as being a through-connection and even if you add a few days it will consider a single sector with stopover, vs. two separate sectors. However if you call you may be able to force it into a fare basis which breaks it into two sectors, probably more expensive though.
One more option but also possibly more expensive is to book LHR-DXB return in J with a side-trip DXB-MEL with one-way in J and return in Y. All in a single ticket so it shows up as one itinerary, but basically you're nesting a side trip at your destination/fare break point