Just had a heat pump installed, cost £7430 with £7500 kindly donated by the government. House was built in the 1930's. No Cavity walls, used most of the old 1980's radiators, replaced 4 out of 18. Kept the hot water tank. Disconnected the mains gas..... Guess what? Just had our first energy bill - £192 CHEAPER than the previous equivalent quarter last year when we were using our gas boiler. AND, the house is so much more warm. So warm, we now have the system thermostat on its lowest setting. Hot water supply is regular and heats in 30 mins after a couple of (very hot) baths.

So much nonsense and misinformation being spread these days about heat pumps. Gas is dead, don't listen to the politicians and vested interests. Get a reputable firm to install and enjoy a nice warm house.