Many thanks for your response. It's in business class, and I'm afraid BA didn't indicate whether it was a One World or Global Explorer.

I see now that the following (SYD-ZQN//CHC-AKL-PPT-BOB-PPT) will need to be on Air NZ (given the days which QF have the codeshare on that route) & Air Tahiti so will need to be booked separately so I think my challenge is the best price for the remainder, with that - if possible- counting as a surface elment.

Many thanks once again.