It depends on what area of Wellington you plan to move back to, because a lot of midwives only service certain areas.
Check out http://www.wellingtonmidwives.com/
I was through Domino Midwives for my first pregnancy and birth and can't speak highly enough of them. http://www.wellingtonmidwives.com/domino/
This time I'm with Birth Options who are also good http://www.wellingtonmidwives.com/
Both groups are very into natural birth.