Unfortunately Bing market share in the UK is still rubbish.
I am number 1 in Bing for the top 3 terms in my niche, and top 5 in Google. 2% of my traffic comes from Bing.
Microsoft needs to do more to encourage use in the UK and Europe. Most Webmasters here would love to have some different opportunities for revenue.
And a bit more competition would keep Google on their toes...