have you tried going to MYBT
Loin to bt.com
Scroll about half way down screen to "Get More From My BT"
Look for the "Your Products" Panel and click the "Manage" button on that panel
Look for the "TV" panel and click the "Manage" button
Whatever the content you see (it's personalised) Click the "Manage" button
You are now on the page that you need. If you don't see what you're looking for, scroll a little further down and click on "Show more TV Deals"