Chris

Point of information on heat pumps: these are widely used in Nordic countries where winters routinely get a lot colder than here. They operate at a lower efficiency at low outdoor temperatures, but operate they do. The problem in the UK (and here I acknowledge I sound like a Polytechnic lecturer with a tarmac and superglue fetish) is lack of adequate home insulation, thanks to centuries of cheap heating fuel first from coal and then gas. We have been able to afford to be wasteful.