Bill: This is a coincidence, of bringing up the GFCI subject. I was surprised to read Old Appy's question here, I was involved on the other thread.
I touched on this subject, and see confirmation of my reference to GFCI's not being prevalent in New Zealand.
The statistics of risk appear to show the lack of necessity. The reliability, and 230 volt design for the sensing system, do not support the cost involved.
New Zealand citizens, and culture, are not bottom line orientated. They are extremely safety knowledgable, and aware of hazards, they provide sure methods to eliminate the cause, not "Smoke and Mirrors" to deal with the resultant effect, of a bad situation.