Gradine: Great - thanks for all good replies.
As I concluded the Igloo system is supplementary to Freeview. Igloo have now confirmed to me that all Freeview (HD) transmissions are available on their system. And, they advise their tuner is not a recorder.
So, sticking with the free options, it looks like I (anyway) shall have a Freeview set up with a record facility of some sort and, maybe get an Igloo tuner so as I have the option of paying for the occasional sport event or "take up" the few Sky channels on a monthly prepay basis.
Thanks for all ideas and comments.
Hmm, looks like I might be able to shoe-horn my S1 Tivo into that mix - provided the Igloo tuner outputs S-Video, as I have with the current old-style Sky Decoder. Not too fussed about the lack of HD support on the S1.
I'm currently on Sky's decoder-rental scheme ($18 per month), so for a few bucks more, I'll have a few more channels. Just in time with the pending demise of TVNZ 7 - I can see my Tivo Now Playing emptying pretty quick :-(