About a week ago, Bing announced they have taken Bing UK (www.bing.co.uk) out of beta. They basically said, you can now get more relevant UK results when in the UK and searching in the UK. Here is a snippet from the blog post:

I personally tried a search for football in Bing.com and Bing.co.uk and I am seeing tailored results for each region. Yes, NFL.com comes up in the UK, but not in the top result. Since I am not from the UK, it is hard for me to judge.

Forum discussion at HighRankings Forum.