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not sure about anything tbh! but this is possible.
the opposite wall has a damp problem and there’s no skirting gaps there, but not a bad.. and had only appeared this year.. (now i’m thinking about it this might be because there’s someone in there working all day..) whereas the holey side has always been bad.
i’m sure the holes aren’t helping. i think when is cold we’d ideally have the dehumidifier on at night when the condensation is produced but so noisy.
rogan
hoefla
Is the skirting/hole to the inside just at the bottom of the render?
Render looks in reasonable nick - any damp patches? If it's not letting rain through, condensation is a real possibility. Are you sure it's plasterboard and not solid plaster? No insulation?
The scenario I'm thinking of is - that horizontal band between ground and first floor is the edge of a solid concrete slab. Huge 'cold bridge'. Concrete conducts heat well, it'll be slightly colder than the brick+render at that point of the inside. Plasterboard is likely fixed onto the brick with 'dabs' leaving a little gap behind it. Hole in the front allows warm humid air to move behind the plasterboard, come into contact with the fairly cold brick+render wall and the colder concrete (or bottom of brick wall resting on the concrete). Condensation ensues. If you can dry it out somehow and seal up the hole and any other holes to prevent warm air getting to the cold surfaces, you solve your condensation issues.