I have squirrelled away my Qantas frequent flyer points and it's now time to bust them out. I've booked a return economy ticket to London in October and am taking the A380 over to London and then a 747 back to Sydney. I don't have enough points to upgrade to business in both directions but have eoght points to do business one way and premium economy in the other. My question is: am I better off going Premium Economy on the A380 to London and then Business on the 747 on the way back or vice versa (I haven't been on A380 before). Any advice appreciated. Thanks.