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House round the corner had insulation badly installed in the 70s, closed off the eaves, ended up with dry rot in the roof.

Need to be careful at the eaves, don't block any ventilation at the eaves so not fully into eaves. Cross ventilation must be maintained to prevent condensation.

You loose more heat through the roof than walls so more cost effective. For floors between storeys you would fit 100mm of insulation between joists for sound so some can be left. The whole area won't be used for a loft conversion so can be left. For the roof itself new insulation would be below...