There is an incredibly annoying bug on the Xbox website that for makes it almost unusable for me - that it keeps redirecting to the US site.
Take a recent example - I got the Xbox sale email on the 17th April. I click through the email and get taken to the "Spring sale" overview page (http://www.xbox.com/en-gb/springsale?CID=EMEA_CRM_Xbox_1090500_1742014_112702_end_cta_alias). It's clearly a UK page (see the 'en-gb' reference in the URL) and contains details of all of the items on sale this weekend.
I spot an item i'm interested in (in this case, Assassins Creed IV Freedom Cry, but it's the same for everything). I click through to see more details and the sale price via the "Learn More" button. I'm taken to the US Freedom Cry page (http://marketplace.xbox.com/en-US/Product/Assassins-Creed-IV-Black-Flag-Freedom-Cry/f01d3dd0-7071-4d60-91be-cb3f3fcc4df6) with the US price. Note that the region reference in the URL has changed to 'en-US'. I can manually change that to en-GB to get the UK price, but I shouldn't have to. The site knows I'm on a UK page and therefore should automatically take me only to the UK prices.
As I say, this has been happening for a few months. I've checked my account region settings and made sure I'm set up as a UK user, but to no avail. Anyone else having this issue?