I did my Advanced Certificate in Wine and Spirits through the New Zealand Institute of Wine Education.
http://www.nziwe.co.nz/courses.php
It's run by 2 masters of wine - Bob Campbell MW and Jane Skilton MW. They do run courses in Wellington as well. Send them an email for more info. You're supposed to do the Intermediate course first but, as long as you have a good knowledge of world wines and basic wine production, you can start on the Advanced.
It's a more business focused qualification but it does take very long to do and is a good grounding. I did a 4 day intensive course and a fair amount of private study and passed with distinction. The course will also provide you with some good networking opportunities as the wine companies send their employees along. I met someone from Villa Maria and lined up a cellarhand job as a result.
I'm now back in the UK doing my Diploma in Wines and Spirits.