Not got a lot of time off work?
Here's he best deal at the moment for £700
Leave Manchester at 13:10 on Wednesday, lay up in Dubai for 2.5 hours and arrive in Melbourne at 23:20 on Thursday night
Returns from Tullamarine at 06:00 on Saturday morning and back in Manchester at 07:00 on Sunday with a rather long 13 hour lay up in Dubai.
That's available on Skyscanner right now and probably won't be there for that long.