Typed a long reply which seems to have disappeared into the ether.
Won't rehash, except to say many thanks to those who took their time to assist.
I have been offered a "deal" (according to the agent) on QF/EK 8417 to Dubai on D class, then QF/EK 8319 to Prague. Return Munich QF/EK 8050 to Dubai, then QF/EK 8414 to Sydney.
Question please: Is this flight on a Qantas plane, or Emirates?
Any input on this most gratefully appreciated!