It looks like a hip? .
Do I need to strip tiles and replace large amount of membrane then put tiles back on?Looks like a valley leak.
I would expect the valley to be purpose made valley tiles under interlocking roof tiles.
No fix its strip and replace
Not sure when I'm going back. Will do when I go back if they haven't moved by then. Membrane does look like it has a small hole in itKeitai,
Why not, as I suggested earlier, just post outside pics of the area - it might be that there's a tile or a slate missing or slipping? Or a simple external solution.
I had a leak in the roof once. You should of seen look on the face of the homeowner.
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