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On March 3rd, the hits on my UK site crashed to 40% of the previous number. I am guessing it may be down to the google algorithm change:- http://wisestartupblog.com/seo/google-algorithm-change-february-2011-losers-winners/5081 However, I am aware this happened on 25th Feb in the US. Do you know when it happened in the UK. Could it have suddenly started affecting me on March 3?

I am looking to add new content to pages that I currently have on my website.  The content on these pages was taken from another provider and my idea is to rewrite the content to make it unique. Because it is duplicate content, these pages don't get much traffic. Should I add the new content to brand new urls or just change the content on these (already indexed urls). The issue has seen these pages contain duplicate content. If the content simply changes, will it recognise these pages as having unique content?