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ectoplasmosis
I hear pavatex recommended but not sure if it's the best for your purpose. Generally, natural building materials suppliers are knowledgeable and give advice, so calling a few might be your best option.
Noticed this place has free online courses, including on internal wall insulation - https://woodfibreinsulation.co.uk/courses/
Suppliers you could try: Back to Earth, Ecomerchant, Unity lime, Mike Wye, Ty Mawr