Very good question. I dug in a little bit and found out that both the Great Britain and United Kingdom option are exactly the same behind the scenes. Both return rankings for google.co.uk. I'm not sure how the GB option got in there, but we'll take it out soon and just leave the UK option.

For any people that chose GB in the past, their campaigns will continue to work and pull UK results.

Sorry for the confusion!

Adam

Hi Stephen,

Webmeup is a crawler unrelated to Moz. Feel free to block them if you'd like, though they don't seem to be nefarious in intent. They've listed info about their crawler and how best to block them here: http://webmeup-crawler.com/.

Hi Julie,

This post might help. It includes some solid advice and techniques to clean up your GA data: https://moz.com/blog/stop-ghost-spam-in-google-analytics-with-one-filter.