Not that I have anything against Canadians or Canada, never been there I'm sure it's a lovely place full of quite wonderful people.
So if you log onto the BioWare Social Network and go to My Games -> Mass Effect 3 -> Leaderboards then you can see your rankings in three categories: Global, Country and Friends
Mine currently looks like this (names and scores obscured to protect the pathetic):
I'd much prefer to know how I rank in England/UK/Britain/Europe than knowing what Canadians are up to!
The Edit Profile on BSN has a "Location" text box, which I've typed "UK" into. The Account Settings has my timezone as GMT. My Xbox and Live account are UK accounts. Following the Add Bioware Points link offers me prices in Pound Sterling, so that's picking up my location ok.
What have I missed, why have I become an honorary Canadian?
EDIT: The plot thickens, Gh0sT's answer sent me off to my EA profile settings where I see this, showing that I've already set my account to UK (which makes sense as I do have an active SWTOR sub and have, reluctantly, bought from Origin in the past, and credit cards do insist on checking your address as they're validated.
BSN still thinks I'm Canadian 🙁
Best Answer
According to this post by a BioWare developer it depends on your EA account settings. Change your country there and you should be good to go. It seems the default value is Canada.
EDIT: It seems you are far from being the only honorary Canadian out there but no matter how great of a site Gaming StackExchange is, there isn't anything we can help you with (well, besides our endless spiritual support, of course!). Perhaps you could try contacting BioWare via their official support channels and demand they threat you as the proud subject of Her Majesty the Queen you most definitely are. Or alternatively keep it calm and quiet until their grace bestows upon you a trip back from the colonies.