Thanks for the link Moorf.
I wasn't sure whether you could get an aga in NZ, or if there was a distributor. On a google search, not a lot comes up!
From talking to people here, they have suggested that oil may be the way to go.
Do you know anyone using oil to heat their home. I saw a home for sale on trademe that had a diesel fire with wetback. Never heard anyone in UK using diesel at home, but maybe they mean gas-oil.
If anyone is in the heating business perhaps they could clarify? Is there a difference ?