As a UK-er who imported a Wii console, the only thing that didn't work straight out of the box was buying Wii Points via a credit card from within the Wii Shop channel, the solution was to simply buy the pre-paid ones and enter the number - which works, but its abit long winded.
The main problem was the billing address for the credit card, it needed to be somewhere in America for the sales tax processing to work. However today some bright spark (Daz over at The Virtual Console Archive) came up with the idea to change the location of the console to Brazil and see how it alters the credit card processing forms.
Genius! It works, you now only get asked for the "Postal Code" from your billing address, enter in the UK info and click proceed, everything works fine, I've tried and tested it myself.
I think I owe Daz a pint.