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Thanks David, some interesting comments on those posts. Normal, I would not bother with disavowing but in this particular instance the volume is at a level to cause serious concern.

that seems to be a common problem, that GWT is slow in removing old 404s, even if they haven't been present for ages. i have that problem particularly from urls that have temporarily shown up on a xml-sitemap. 6 months later, they're still there... guess as usual, we'll just have to wait for the bug to be fixed...