Circular damp spots

Hi the circular damp spots are plasterboard adhesive whitch have been troweled to the wall to attach plasterboard . When the wall gets damp it transfers from the wall through these and shows through the plaster and paint . Conclusion is you have damp whitch may be coming from a leaky gutter or roof also it could be rising damp from a failed or no damp course membrane .The gutters you have mentioned may be blocked and also check the fall pipe is not also blocked and this causing the gutters to fill with water and enter the walls

Hi Stephen, 1. Is your 'stone' guttering actually Finlock concrete guttering (circa 1950-1970)? If so, it is likely allowing water ingress between sections, as these gutters span from outside to inside of the house. If so, you may also see damp and mould along the top of bedroom walls? Rather than relining, you may want to consider their removal and replacement with PVCu, see my profile for examples. 2. If your newly plastered walls are solid (no cavity) then it might be that the plasterer 'dot and dabbed' plasterboard direct onto the wall face, and this is not what should be done, as the 'dot' (adhesive) acts as a direct transfer of moisture, outside to inside. 3. Another situation where damp patches can occur via dirty wall ties, whereby moisture gets into the cavity and transfers to the inner wall face, at more regular intervals. Hope that helps, thanks, Jason.