Had the tiles and roofing felt been in good condition, we would have done something less drastic, probably placing a high spec insulation between the existing rafters and getting to modern structural standards by adding extra joists and rafters as required.
In our quest to create an ultra-low energy home, we are also blocking up other holes - including the two chimneys and the many air bricks that seem to abound in every room. (There will be ventilation - but it will be controlled using windows and a ventilation system with heat recovery, not through gaps in the building fabric.)
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