http://www.mobiletoday.co.uk/news/industry/28787/ee-and-vodafone-clash-over-rootmetrics-network-test.aspx
Take it for what its worth but there does seem to be a flaw in not standardizing the devices used for data acquisition. I know, it is probably not enough to materially change the data set. However, there is the appearance of favoritism. You should not peddle your results to the public AND sell them to corporations. Its a conflict of interest in my opinion. As much as I loath Consumer Reports, that is one of the few things they have gotten right.