I have been monitoring quite a few keywords from multiple Google country engines and if what I am interpreting is right, Google has made some changes to the country TLD of domain names. The changes I am seeing are:

1. Country TLDs ranking for a different country has been pushed down. For example, if you were ranking in the US with a .co.uk domain, that should have been affected now.

2. Generic TLD websites targeting very specific local geographies have been pushed down. So if you had a .com targeting London specifically, then you may have seen a drop in the Google.co.uk search.

My sample size is limited. So can I have others who fall in the above group to chime in on this. The change should have happened sometime since the second week of February.