Xbox live currency problem

Loris

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When I go to buy something it's In dollars, I need it in pounds, any idea how to fix this?
 
Change location via xbox system setti,gs and gamer tag maybe?
 
Sarcasm said:
Change your local to United Kingdom.  You should be good then.

It is on United kingdom but the currency hasn't changed
 

I think you have to move your account to another country on Xbox com not just change, but j can't find the feature:/