A Google Webmaster Help thread reports that some webmasters (at least one) has set his Google Webmaster Tools to geo-target to the UK, but the site is ending up being geo-targeted to France.
Here is what the webmaster said:
This has happened in the lask 4 weeks - although we will want high results on google.fr eventually, most of our audience is UK based and I don't think they are seeing the results they used to get as they are (it seems) appearing only on the google.fr search engine.
JohnMu from Google said he needs to look into the issue and that he will "pass it on to the team here to look at!" I guess this might be an individual issue or maybe a larger issue with some sites?
I should note that the domain ends in a .eu.
Forum discussion at Google Webmaster Help.