Have finally coughed-up for a D class RTW fare :
TYO AY X/HEL AY LON AA(BA) X/LAX QF BNE QF CHC//AKL CX HKG CX CGK JL TYO
I have Basic membership of AY & BA schemes & use BA-AX card for spending to accrue Avios. I’m not wildly interested in Status, which Membership will generate the most Avios please?