My landline is part of a bundle and I haven't used it for a couple of years. I've tried plugging into the Hub and, separately, into the NTL (Virgin) socket but neither work.
I have checked that the handset works OK using my current BT landline.
Thanks for posting, and sorry to hear you're having some issues with the line.
Thanks for going through the checks you have already, so I can take a closer look I've popped you over a private message (purple envelope, top right hand corner)