Don't forget the basics > Block those search result pages

It's right there in Google's guidelines>
Use robots.txt to prevent crawling of search results pages or other auto-generated pages that don't add much value for users coming from search engines

Take a read of this article, one of the SEO consultants eventually figured it out and the site recovered ;)

seomarketinggoddess.blogspot.co.uk/2013/01/seo-issues-it-is-penguin-is-it-panda-or.html
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