atlrus - 12:50 am on Aug 27, 2008 (gmt 0)

You mean a few co.uk's of yours? Have you checked the rankings on google.co.uk before switching to .com? Cleared the cache and cookies? Browser's default (english) languages? Tried the same query from another PC?

Yes to all, including from different ISPs. I think a big update is coming (or a small shake-up) aside from the ordinary move. The returned results on one of the keywords I monitor jumped three-fold...