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@andos
I think I know the answer to this, but...
...my very old house has fibre glass insulation attached to the roof "sheathing" (this is old wood boards). I have never really poked my head in the loft but I did last night and noticed that one baton/beam was a bit wet. Likely condensation, which I would assume is from having fibreglass insulation right up against it reducing airflow.
Paging @TW as he seems to know his roofing.