Some Simple / Small Dry-Lining

just trying to prevent any unintended consequences - like mould / condensation
If you create a cavity wall system with an warm room touching an insulated wall, touching a cavity, touching a cool uninsulated wall, touching the world.. and then allow warm moist air from the house side of the insulated leaf, to circulate into the cavity, you cause damp/mould/condensation in the cavity
 
Thank you @robinbanks & @foxhole.
sounds like I need to batten and insulate.
I’m thinking because of the age of the house I should use a breathable insulation ?
And would I need any sort of membrane between plasterboard and insulation ?

Thanks D
 

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