Plus housing insulation. So many British houses are still almost entirely uninsulated. That's not an exaggeration, the roof of my house had zero insulation, solid brick walls, no under floor insulation and single glazing. The only gesture to efficiency was some secondary glazing over the windows.

It absolutely ripped though gas just to keep a couple of rooms warm enough to live in, and it was still two jumpers and thermal trousers indoors. God only knows how the pensioner who lived there before managed.