SASKATOON9999,
EGKK - NZCH = 10254.1 nm (Perfect Sphere), 10257 nm (WGS84)
EGAA - NZCH = 10128.2 nm (Perfect Sphere), 10129 nm (WGS84)
I think maybe you were looking at the Belfast - Christchurch distance in Statute Miles - maybe.
It seems that UK/Ireland - New Zealand pairs have been exceeded by others anyway, any last votes?
Regards,
Old Smokey