I don't think a statement like "well and truly Xbox country" can be validated based on a time period of your choosing - it's a generational statement and should be evaluated as such. If the PS3 outsold the Wii and X360 in the UK next year (and even the year after), that would not make it "well and truly" PS3 country.
The OP is talking about the present and why retailers are treating the Wii the way it is, don't be so anal about my comment, I'm spot on.
The last 2 years the 360 has been dominating Wii here, and going forward will too. It'll overtake the Wii lifetime at some point late 2012 onwards.
Wii selling well and being the #1 choice here was a long time ago now. The country has well and truly moved onto Xbox, the way they did with the Wii against the PS2.