UK total gas demand now is around 750 TWh/annum
•Around 50% domestic heating, 25% power gen and 25% industry
•Biomethane by 2030 is around 20 TWh, though we have only scratched the surface…..
•For heat in cities there are few practical/economic alternatives
•Biomass (air quality), heat pumps (do not work in very cold weather), district heating (too late to dig up cities