You're acting very surprised that you're finding it hard to get a Wii right after christmas. For starters, it's been out for a year and if you wanted one THAT badly there were hundreds in the stores during the summer, also it's the most wanted christmas gift this year and last. (PS3 still being just that little bit too expensive for the average family) On TV, talkshow hosts that were doing Toy's for Christmas specials, were stopping half way through to say "And Santa's told me, that he's been very busy getting Nintendo Wii's, and he may not have enough to go around. SO boys girls, don't be upset if he hasn't go you one yet." This was to take pressure off parents I assume... or he was really talking to santa. But the point is, you could've gotten one earlier in the year and if you're really desperate, buy one off ebay that's coming from Germany, or some other European country. And if you're even more desperate than that, you could always hijack a truck with the next shipment of Wii's to your local game store. (True story- Happened in N. Ireland around Nov) If you can't find anything decent on Ebay, you can always wait for spring when more consoles generally tend to appear in shops.
Also, £180 is a fucking bargain compared £425 for a PS3 upon it's release and £250 Xbox 360. And don't get angry at Nintendo because they're finding it hard to meet demands, if anything you should be thanking them for making a console that you want so badly.