1. No APD earn on BA legs, the LHR APD earn is with the VS codeshare from LA/SFO
2. on BA business class - CX lounge I believe, +1 Guest
3. RU/EAPDU/Oneup is only for that specific sector, and only on NZ metal.
4.
5. who knows with NZ?!?
6. Can't guest in Polaris, but you can guest +1 in United, and Mrs B can guest +1 if EP.