Historic Scotland have some case studies that may be relevant, though 1900 is a bit new:
https://www.historicenvironment.scot/about-us/what-we-do/conservation/refurbishment-case-studies/
Was it suggested to you that you should use a vapour-open and absorbent material like sheep's wool, wood fibre, hemp etc. rather than kingspan?
https://www.historicenvironment.scot/about-us/what-we-do/conservation/refurbishment-case-studies/
Was it suggested to you that you should use a vapour-open and absorbent material like sheep's wool, wood fibre, hemp etc. rather than kingspan?