The most direct routing would be via HKG on BA/CX or all CX in premium economy.
Other oneworld options:
SIN-SYD on BA WTP and on to AKL with QF in economy.
DXB-SYD/MEL on QF premium economy and on to AKL with QF in economy.
Via KUL with MH in economy.
Qatar to Australia and on to AKL with QF in economy.
See also:
http://www.flyertalk.com/forum/briti...-auckland.html