Hiya does anyone know if it's possible to renew a nz instrument rating in the uk on an nz reg'd aeroplane?
I would say Yes, I know you can do a New Zealand BFR over there in a NZ registered plane, BUT it would need to be done with someone who has NZ IR renewal privileges.
As for the BGT, try contacting ASL or look on their website to see if they have facilities to deliver exams in your part of the world.