As I have dual nationality, I have two passports; a kiwi one and a British one. Later on this year i'm flying to the UK and this is where my problem arises. If I check out of NZ with my Kiwi passport, do I have to check into England on that one, or can I skip the long queue at the airport and check in with my British one? The problem being, that there would be no stamp in my British one to show where i'd been. And then if I have to check in with Kiwi one I get the long ass queue. Or do I show both? Anyone have any info/ideas about this?