In the mid 80s I went to view some energy efficient showhouses in Milton Keynes. Built to a high standard of energy recovery and re-use, with heat exchange units and solar panels. Nothing so grand or as efficient as available today but I recall that energy bills would be something like 10-20% of average. .
There's been an average of 180,00 or so new houses per year built since then and yet, with that knowledge and availability of energy reduction measures back then , NO government has made it mandatory to build to the highest energy efficiency.
A wasted opportunity for the UK.
However not wasted on me - we have peak insulation/doubleglazing/solar etc.
We're looking at water efficiency, rainwater storage and waste water recycling as we feel this is another area bills will vastly increase. Sadly Thames Water loose so much from leaky pipes and don't believe you when you repeatedly report a fault. Took them 3 years and multiple reports to find and fix one in my road which meant my washing machine failed to fill properly due to lack of pressure