Water membrane

Edit: having just re-read your last post, to sum up, trying to sort this by drilling holes in bits of wood for drainage is a right bodge and you'll end up with the same problems you have now. Fix the UPVC gutter behind the fascia, dress the membrane into it and drain it with a downpipe through the soffit.

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I do like this idea but I don't think the gradient makes this possible TBH.

I need to check the state of the roof after the recent rains to see how far it has gone back up on itself.

Is there no sealant that could stick down the membrain to the roof?

Thanks in hope!