Re: Free market?
BT was gifted all that expensive (monopoly) infrastructure for a knock down price back in the 80s
And you think BT are still using that network unaltered from the way the PO left it? BT pretty much rebuilt the core using fibre optics (a condition of the floatation I believe) and upgraded all the exchanges to digital. A lot of the local loop is unchanged from PO days but a lot of houses have been built in the last 30 years so even that has been considerably extended since privatisation. And that's to say nothing of the roll-out of v90(*), IDSN, ADSL and now the installation of thousands of street-side cabinets.
Harping on about what BT may or may not have inherited from the PO is unhelpful. It was over 30 years ago and in telephony terms that makes it pre-history. What BT inherited from the PO was a network creaking at the seams, barely fit for purpose and in need of serious investment. BT has brought that network into the modern world and turned it into a world-class telephony network.
BT has earned the right to be judged on its own merits. Criticise if it you want but stop dragging ancient history into the discussion, please.
(*)That required BT to install modems in telephone exchanges so that one of the D/A conversions could be skipped.