Re: good starting point
Yup, it's called sidecar cable. One coax, two twisted pair. The latter is for the phone, the former for TV/Internet.
Was like that twenty years ago and it's not changed.
Flip side: BT were supposed to have burried all their suspended cables (phone lines) by... six years ago... after they failed to do it for eleven years ago... after they failed to do that sixteen years ago... so what hope have you of them actually completing laying fibre to their exchanges? There are still areas with suspended phone lines that BT can't be bothered replacing, it seems.
Ah, well: Back to the drawing board...