You are registered in the UK, but you are currently on the US ebay.com discussion boards. Trying to view your UK seller account on ebay.com can have all sorts of unintended issues.
Clear your ebay.com cookies, and sign back in to the ebay.co.uk UK site.
If you use your browser's autocomplete to enter addresses, clear your browser history or else you will likely be sent back to the .com site by your browser.
Make sure you are not following any US ebay.com links or using any ebay.com bookmarks.
If labels are not printing for you on ebay.co.uk, try saving and opening the label using a PDF Reader rather than using a browser.
