@ Dashu, these data centres, are they like one for each country, as in google.co.uk .com, .es, .it etc, and they corrolate the information from each to give an overall page ranking?
I thought with it being a .co.uk domain that it would only matter what UK Google data said. Anyway, it has bounced back up to result 3 on page 1 of Google UK for the term "carbon bikes" again, lets see how long it stays there this time