Uber_SEO - 11:40 am on Dec 14, 2011 (gmt 0)

Just got back from a holiday and checking up on some sites. I'm noticing some significant flux on 29th November (some KWs just plummeted), followed by further flux on 8th December (some dropped KWs returned, others that hadn't dropped then did). Doesn't appear to be any rhyme nor reason as to why certain KWs / URLs were effected.