"J Ashton" wrote
| It's in an area without gas so I suppose the
| choices are oil or electricity.

Solid fuel might be an option. Especially if you have space for a boiler
house you can get self-feeding solid fuel boilers rather than having fuel in
the house.

Calor is another possibility. Expensive to run, but the tank can be buried
in a permanent installation. (At least, they can in Italy, and we're in
Europe now...)

Obviously the more you can insulate the less heat you will need.

Owain