Ok. Well I am flying LHR-SYD (Q), SYD-MEL (S), MEL-ADL (S) ADL-LHR (S) and my g/f is going LHR-SYD (Q), SYD-MEL (M), MEL-LHR (M).

No idea why the different fare classes for the both of us, thats just what they assigned us. We both signed up for QF FF program and put our numbers on our bookings.

Haven't got any plans to go to Oz again yet, possibly somewhere else though.