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When I looked at it, sheep wool and wood wool boards came out as the way to go. You would need to be sure that the wall is still breathable though (lime plaster inside, lime render outside).
Condensation will always be a concern between the colder exterior wall and the warm interior boarding.
In the end, I went with a 2x2 stud wall, with a 2 inch layoff from the exterior wall, to allow for airflow from the airbricks under the floor level to the airbricks in the ceiling void.
NotThamesWater
@JonoMarshall
Has anyone had experience with breathable Internal Wall Insulation (IWI)?
I'm trying to achieve 0.3W/m2K in a Victorian property with solid brick walls. The acoustic properties of wood fibre are appealing, but no air gap between external wall and internal boards feels odd/worrying?