Re: It would be nice..
"..if like the electrical power / rail / gas infrastructures in the Uk, the telco infrastructure was owned by one company and leased out to the many suppliers.
And I certainly don't mean in the way BT is working that system."
https://en.wikipedia.org/wiki/Chorus_Limited
This was New Zealand's solution to the incumbent telco playing games with its supposedly "chinese walled" lines division. The UK (and other countries) need to do the same thing.
Since the lines part was split into its own company, the New Zealand market has transformed from being dominated by a rapacious monopoly(*) to having strong competition at all levels.
(*) New Zealand used to be held up as the poster child of how NOT to privatise your govt-owned telecommunications system.