Yes it was an old leased line (and they where the 3rd party tail) I still have an in traffic lit pair as well on the same cable. My networks man tried to contact virgin, but I think he got sent round the houses as they where only interested in Coax. I do have a number to try next week when I'm back in the office.
A bit of context - they want an internet service as a 3rd party solution for a group of people in the press office, and a number of phone signal booster devices. Coax would be fine - but VM are giving us problems over excess construction charges etc so we thought we would try and light another pair on the optical cable since we are already connected.