I'd love to know more detail on the insulation as I live in a Victorian stone building. One person says "external walls internally insulated [...] and the loft insulation improved, a process she describes as “very invasive” but worthwhile." Presumably they're stripping off the internal lath-and-plaster from external walls then replacing with insulation-backed board. Maybe the the new room size is smaller meaning any plaster cornicing has to be ripped out/replaced. I can see why she calls it very invasive. Personally I find draughts to be a huge problem. When it's cold and windy it's especially cold inside. But I don't know how to fix draughts without risking dampness or rot - never found any government guidance on this. It's a huge pain and I am not sure there is an easy "insulate" solution for these old properties.