Wilburforce - 1:53 pm on Oct 31, 2013 (gmt 0)
For our main term it's never served now.
That happened to my homepage - to all pages, including the Key Term page, for that matter - with Peguin 2 in May, and it certainly wasn't caused by disavowal. More likely, I suspect (especially as it coincided with Penguin 2) that masses of worthless links to my homepage with identical anchor-text had something to do with it, but there is no way to isolate a single cause.
Have you tried the "Repeat the search with the <very similar> results included" option? My homepage appears in the results (albeit on p. 27) if I do that. The reason obviously isn't other pages from my site - there are none - and there is no site anywhere in the results that has obviously copied any of my homepage, let alone enough to make the pages very similar. If anyone has any ideas about what could account for this, they would be welcome.