I’ve just discovered this rather lengthy document and thought it might benefit some forum members.
https://app-hes-pubs-prod-neu-01.azurewebsites.net/api/file/dabb77eb-0b56-488c-952e-addd009c58c3
This no longer seems to be working on my machine, @Tim_Gilbert, but perhaps it is just my system which is faulty.
I have tried the link myself and unfortunately it no longer works. I have looked for an active link. Try
https://historicengland.org.uk/images-books/publications/eehb-how-to-improve-energy-efficiency/heag094-how-to-improve-energy-efficiency/
The original post is too old for me to edit.
Edit: This is not a like for like substitution. The original post was for traditional buildings but the replacement is for historic buildings. I included it as it was all I could find at the time and it still held pertinent information.
I came across this today:
A new link for traditional buildings:
I would also recommend this book from the Society for the Protection of Ancient Buidings. A good read.
Two new publications. Same problem. Neither is a short read.
https://assets.gov.ie/298558/1a53384e-2a2d-4c4d-83b4-4e7bc87731df.pdf#page=null
More from Historic England, this time regarding heat pumps.