Here is their website.

http://www.teararoa.org.nz/index.cfm

btw, if you haven't spent any time there, you have no idea how bad the weather can be pretty much any time of the year. I've been rained on heavily from Keri Keri on the North Island to Lake Manapouri on the South Island. Anyone planning on this trip should be prepared with good gear for all conditions, including snow and ice at Arthur's Pass, depending on when you are there.
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Don't get me started, you know how I get.