Oh the network, yes. My childhood home was built in the 30s, and we had a phone. I don't know if the poles and wires were put up when the small estate was built, or a bit later, but that bit of the GPO network is still there.
I was referring to the time from when the rules relaxed and the home equipment changed, and people could easily run extension sockets around the house instead of having to sit in the hall.
BTW - if anybody has, or comes into, one of those phone benches which used to be popular, don't ever think "nobody wants those any more" and head for the dump.
They do want them:
https://www.vinterior.co/search?q=telephone+bench