Valleys causing damp?

Joined
14 Feb 2015
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London
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United Kingdom
Some spots of mildew/mild have developed directly above the corner of my bay windows.

The windows were replaced a few years ago, not well. The huge gap you can see I’ve just siliconed up.

However, from the outside at ground level I can seek it’s full of mouldyness on the valley and soffit. On the inside the wood feels cold and dark, but it’s not obviously soft and wet.

I do wonder if there might be a leak. Can anyone with a more experienced eye see something I can’t, or have some suggestions to confirm a leak? Even if I get a ladder up to the valley, I have no idea what I’d be looking for!
 

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