An interview with James Traynor of ECD Architects about retrofit, EnerPHit, Portsmouth's Wilmcote House project (the largest scale retrofit of its type, in its day), and James's fabulous book about EnerPHit. 

https://www.ribabooks.com/enerphit-a-step-by-step-guide-to-low-energy-retrofit_9781859468197

https://ecda.co.uk/projects/wilmcote-house-2/