Interesting that you mention condensation We

https://trevorhqrk876.quantlynix.com/posts/roofers-cardiff-redland-roofing-cardiff-family-roofers-for-over-30-years

Interesting that you mention condensation. We were convinced our loft had a leak but it was actually poor ventilation making the underside of the roof sweat. Two vents later and the problem has gone