Best solution for cold bedroom walls

[Blossomhill123]

I’m looking to redecorate the front bedroom of my north facing 1930s end terrace .
The previous owners have left polystyrene backed wallpaper ,I would imagine to keep damp and cold away .
What would be the best solution to keep the condensation away.?
I’m current looking at wall rock thermal wallpaper or can anyone suggest something better ? Thanks

We had a surveyor recommend a type of paint with glass in for cold walls. Not this actual one because it was their own but it gives you the info about the glass microspheres.
allianceremedialsupplies.co.uk/product/suretherm-anti-condensation-paint/

We got ours through Peter cox but I haven’t opened the tin yet.
www.petercox.com/our-services/condensation/solutions/anti-condensation-paint/

I think if the walls feel cold, and there’s condensation, you need to increase the heating temperature, make sure the air vents are not blocked and maybe get a dehumidifier in the room. We’ve lived in a north facing house for years, only upping the thermostat in the rooms at the front worked.