In reply to Danny Brown.

Hi Danny. If the Alexa figures were an estimate based on a sample then you could well be right. However I believe that Alexa are quoting actual 'big data' pulled directly from the millions of Alexa toolbars .

I can't see that there would be much that is quantitatively different about those website people who have Alexa installed and the rest. Therefore I feel its safe to give these figures serious creedence. .. I might be missing something. If so, would love to know.