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Does Verbascum nigrum have basal lobes to the leaves, then, like Scrophularia auriculata?
I'm not doubting Tim (!), but I'd be interested to know why it is so definitely not Water Figwort.
My Flickr photos...
can see why you suggested Scrophularia but the whole leaf shape is wrong and the texture and colour different, hard to put into words
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OS grid ref: SE3940