Wilburforce - 9:18 am on Apr 28, 2012 (gmt 0)
For main business search term my site dropped from #3/4 to #10 at the end of March, to page 2 - with a couple of visits to p15 and beyond in the meantime - during the last couple of weeks, then to #27 yesterday.
A lot of other terms (finding a lot of other pages) are doing the same thing. Google referred (i.e. most) traffic has fallen massively.
As content includes a lot of links to manufacturers of the products we supply (on a relevance, not a paid basis) I suspect the site is being marked down as an affiliate. Currently removing all outward links to see if this has any effect.