coffeebaron: Hi Graham,
I think I remember talking to you a while ago. I am the dealer / installer for www.ultimatemobile.co.nz in the Waikato area. Flick me a PM as we can offer you a solution right now.
Get on to this man. Your broadband will probably be cheaper (and maybe faster) using a wifi network than the RBI. This is of course assuming they can reach you with their wifi network.