If you are exploring how to insulate a traditional stone building, you will find this helpful. Anthony Gwynne of Forest of Dean Council has written a detailed report on upgrading stone buildings.
Topics covered by the report include:
The Centre for Alternative Technology also have experience of stone buildings in Wales and will be a helpful source of additional advice and case studies. They offer a free advice line on 01654 705989 or email info@cat.org.uk.