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Your friendly local planning permission place might have all the standards online (the NI planning board does, you have to declare insulation for inspection) and Youtube is very good too.
I second buying wool insulation, be aware wool can be eaten by moths if not treated. But there is special wool insulation, everything at BnQ here in Belfast is selling out too. Only 10 cm rolls left (ffs)
Makes sense. Wasn't sure if it could cause a fire risk. We need to get the electrics in the whole house done anywa.