We are rebuilding our house in order to make it more energy efficient (it would be impossible - based on it's current design and build - to make any effective changes to improve efficiency in the long term and the house is ugly and too small anyway!!).
We will have a ground source heat pump to supply underfloor heating, very efficient glazing and insulation, solar panels on the roof of the house and 8kW of PVs on the roof of the workshop.
We will NEVER get our money back but that's not why I'm doing it.
I want peace of mind with regard to energy and heating and I expect - when we come to sell our house in 20 - 30 years time (when we're too old and arthritic to run it to its full potential), properties that are self-sufficient in energy production may well fetch a premium.
However, just in case I am increasing my collection of cute little oil lamps
