Hello DIYnotters!
Got a few questions regarding damp but some useful info beforehand:
Property is end terraced, built around 1990, in Swansea, no subsidence/coal mining nearby and lastly - the house has ventilation grills that cover holes drilled through to the exterior of the building in...
So we have a conventional boiler and CH system and recently (last week or so) I've noticed it getting worse at heating the downstairs radiators.
For a bit of potentially useful background - In November I added a rad in our basement and balanced the system after that things were working mostly...