We looked at solid fuel stoves, the suppliers and installers, and the possibilities for diverting heat to our central heating system.
Having powered a small cast iron stove for a few years now, we can definitely recommend one - as long as you are prepared for up-front costs, regular maintenance and humping dirty fuel indoors!
Starting point: The Solid Fuel Association with a small list of solid fuel manufacturer/suppliers.
HETAS is the official body recognised by government to Approve solid fuel domestic heating appliances, fuels and services.
Stoves are covered by Building Regulations, Document J