You are registered in the UK, but you are currently signed in to the US ebay.com site.
You may want to sign out here and sign back in to the UK site:
https://www.ebay.co.uk/
Clear your ebay.com cookies from your browser. If you use your browser's autocomplete function to navigate, clear your browser history so you are not sent back to the US site. Make sure you are not using an ebay.com bookmark or following a US link to reach the site.
If you are having problems on ebay.co.uk, you may want to post on the UK discussion boards to see if there are issues specific to your location:
https://community.ebay.co.uk/
