Lead Flashing and Lead Joint Repairs Cardiff Leaks Around Walls and Extensions
https://lanebrxm357.unionquill.com/posts/roofers-cardiff-redland-roofing-cardiff-family-roofers-for-over-30-years-2
Water is patient. It will find the smallest gap where a roof meets a wall, run along the inside of the brickwork and appear somewhere that makes no sense at all