Hi everyone,   I am completely renovating my 70’s bungalow.  I would love to hear your ideas on is, what insulation spec would you do with my current build up on the external leaf, I am replacing all windows, doors, heating and electrics so I want to get the insulation within a good standard,   currently the kit has 70mm stud walls filled with what looks like 50/60mm cotton insulation in brown paper bags with a clear polythene wrap stapled over finished with plasterbo