I have not noticed any significant changes in traffic to any of my UK site. However one think I noticed is that a ban on a .co.uk site of mine which was placed by Google about a year or two ago was lifted though I have been too lazy to find why and correct it all this years.

I noticed that google is making use of your IP address more and showing you results from your country when you search now. Perhaps using a USA proxy server would be best to check your serahc positions, as they'd be different for a guy with a US IP adddress.