Major Drop Offs....what happened?!
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Hi James,
I would try changing everything back to see how that affects your site, if you had some strong links on those archived pages they may have influenced your results.
On a side note...
I am afraid you may have been affected by Googles Penguin update. A quick glance at your backing profile shows that your site http://www.businessinteriors.co.uk/ has many inbound links however not enough branded links. To a search engine this looks fabricated rather than natural. A natural profile will have majority of the inbound links branded (diverse) some long tail (diverse) and few [exact] keywords.
Also what type of sites are you getting links from? are these sites relevant to your industry? Are you listed on sites with lots of irrelevant links?
Google wants you to earn your keep, build valuable information and help their users. If the users like your site you will rank again.