Well I can see why with virgin - but no if that was the case no one would ever had had Home Highway!
Well Home Highway (actually ISDN2 under a domestic name) run two digital lines over a single twisted pair, and provided two built in analogue telephone adaptors in the insanely large Home Highway wall mounted box. Most homes have two separate twisted pairs, which means two phone lines, or one ISDN and one analogue etc. ADSL and VDSL (FTTC) run over analogue.
Virgin's coax / DOCSIS network don't provide two data connections to a single dwelling purely for network planning purposes. They will supply separate flats in a block. They have capacity planning requirements of the HFC network due to the coax side being contended between all people on the same segment.
Those of us who used to network using 10BASE2 coax remember this sort of contention quite well
James -
plusnet unlimited fibre - 2 Jun 14 - 470m - 80/20 - Summer/dry sync 55/9.4, Winter/wet sync 52/9.1
15 years broadband (1999 ntl:cable trial) - Asus RT-AC68U with HG612 - BQM - Summer PN speed - Winter PN speed