Yeah I put one for the outside and one for the inside coz I got told there both separate issues. I don’t really know how this forum works so I thought it might be easier to put them on different threads. Might of been easier to put it all on this one but I’m pretty clueless x
When do these damp stains appear? After rain, some days, some evenings? Apart from the one near the ceiling, they do seem like condensation damp.
Do you think that you have a humid house? Heating on high, washing drying in rooms, cooking steam travelling around. Be honest with yourself and think whether it could be this. Nothing wrong with that, and it may be difficult to gauge your "normal" from someone else's, but condensation from your use of the house may be a, or the factor.
The one near the ceiling may be a leak from above - bathroom, WC?
Otherwise what is on the external walls directly outside?