Originally Posted by UnitedSkies
I haven't tried because the drop down box for the "COUNTRY" field where I enter the credit card details is defaulted to "UNITED KINGDOM."
Just put all the info in correctly other than the country. With BA, the system just deals with it (not sure about NZ) BUT you could call their UK res system and explain that you are looking to go ex-LHR (you could even say you were temporarily located in the UK for work or something if they ask why ex-LHR)