Good Afternoon, My name is James Rixon and I am director of a local Architecture practice rixon architecture. We specialise in low carbon and sustainable design with a particular interest in retrofit. Am really please to hear this being discussed as a topic, I have actually just responded to someone on a separate thread about internal wall insulation which I have copies below. My current understanding is that yes you can heat your home with a heat pump, and there is a chance you may have to change your radiators due to output size. it will likely cost 10-16k to install and even though they are extremely efficient in terms of units of heat out compared to units of energy in you will end up paying more for your heating without additional measures due the cost difference between gas and electricity. A few tips on internal wall insulation: make sure all wall papers and substrates are removed before installation as these could encourage mould growth. Consider ventilation improvements. Think about junctions with wall, floor, ceilings and windows as there is a risk of creating an acute cold bridge. Consider vapour permeable insulations to limit moisture getting trapped against the cold outer wall and applying brick cream to the external wall which limits the adsorption externally look at natural materials as carbon saving can be made not just in the operation of a building but also with that materials used. We are currently developing tailored reports for clients for a reduced fee starting at ?200. This would include a site visit, and visual survey and then go on to outline an appropriate retrofit plan along with advice on how to approach this in stages. If this could be of use to you please get in touch. All the best James Rixon