>> It's not an either / or.
But it can only show if its both.
>
The old part of my 1930's bungalow has no cavity wall, simply double skin bricks. The North facing corner (ie two external walls) is very prone to damp if its cold. The answer everyone has found that works is to install low powered (ie 60 watts) "cupboard heaters" near floor level. They promote a circulation of warmer air up the wall. www.amazon.co.uk/Hyco-TH02B-Sahara-Tubular-Heater/dp/B07NHY5W4T
and/or line the walls with this. uk.rs-online.com/web/p/thermal-insulation/7248906
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