The UK is the largest market in Europe. But the question should be, how is the PS3 selling in comparison to the 360 there? If the gap isn't really huge then the numbers in the UK is insignificant in comparison to whole Europe where Sony has France, Germany, Italy and especially Spain. Spain is entirely Sony land and from my understanding people there also prefer it over a Wii. All the smaller countries seems to side with the PS3 > 360 as well.
There was an article I read recently that Uncharted has actually held the number 1 spot in the UK game sales for some time in December. This leads me to believe that Uk gamers likes the PS3 more then people in the US.
We don't know what the sales numbers are to be honest the last set that people refer to are the numbers Laa Yosh gave in earlier in the Thread. At the end of August/ September Xbox 360 was around 1 million units ahead. I'd be suprised is thats changed much.