Correct me if I'm wrong but isn't console gaming as a whole on a sharp decline in Europe?
Well, all the markets (US, Japan and PAL) are suffering (probably due to the economical situation) compared to the "golden age" of DS + Wii sales (that set records for specific periods), but UK suffered a lot. French and German markets in the recent analysis were almost as big as UK one, especially because of the big (-40% YoY) decrease of the market in UK (more than an increase in their respective countries)
So, UK market is still the biggest market in PAL territories, but not as it was few years ago.