Wilburforce - 11:40 am on Feb 2, 2013 (gmt 0)
An issue I reported some time ago is again in evidence: my home page (www.mysite.com) and key term page (www.mysite.com/key-term.htm) have switched positions several times in the last year, and have done so again: mysite.com has gone from (last seen at) page 4 of the results to nowhere, and mysite.com.key-term.htm has returned from nowhere to page 7 (although page 7 might as well be nowhere for all the traffic it brings).
I am sure there is a clue in this somewhere, if I could only figure it out.
There is also an anomaly between google.co.uk (which returns the page 7 result) and google.com (where neither page is in the first 40, although a number of UK pages that are lower down in the UK SERPS are still in the .com results). This might be a DC issue, but it has persisted for several days.