1. Sectorlink sees domain pointing to new host.
2. DNS change hasn't reached NZ yet, so I see domain pointing to Sectorlink page.
Now, this shouldn't be a problem, but apparently for the NZDWFC subdomain to work, Sectorlink has to be able to see the tetrap.com domain pointing at my page on its server.
The upshot is that anyone who still sees the DNS pointed at the Sectorlink page will no longer be able to access the NZDWFC site.
Buggery in a bucket!
This should rectify itself once the DNS changes propogate, so I hope they do so with all speed.