Robert_Charlton - 4:05 am on Nov 12, 2012 (gmt 0)
My bad. I was looking at the chart for roughly corresponding dates, and was looking at 2011. Again, Panda shouldn't have taken you out completely.
The site does show up in the other SERP's so it looks like it's just Google that are unhappy with it....
If Google's the only problem, then it's most probably something like backlinks or perceived spam... perhaps not in sync with the announced major updates, but one of the many algo changes that happen every day.
The topic of the site site is web design, logo design and print services.
Normally, we like to try to avoid site topics too, but let's let this one go. One possible idiosyncrasy of a web design site would be that many of them depend on global footer links for ranking. It's likely at some point that Google has discounted these. I can't imagine that the site you're dealing with would have been so dependent on them that it would have been removed from the index, unless they appear to be intentionally manipulative.
Just fishing for ideas... did the site itself design WordPress themes?