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You'd be surprised at how fucked up a tile / slate covering can be and yet the roof still keeps the water out. It's at the borders, edges and stuff passing through it where shit easily goes wrong.
If there are sections of concern you could try selectively covering them with a tarp and see if it helps, might be able to rule some things out that way.
Good luck!
Howard
@andos
Good shout on the down pipe and I haven’t aimed a hose at the new roof yet.
The reason I suspect the older roof is that there was evidence of damp where the new valley is when we had the extension done. So I assumed that was the issue. I still think the gaps in the slates aren’t right too...