Obviously I can't comment on your experience from 2001, but what I can categorically say, is that when we closed an Installation Task, (before Openreach was formed), we had 3 sections to fill in regarding the wiring details.
The first was a box asking 'Is there evidence that service ahs previously existed ?'. We indicated that there was by way of inputting a '1', or that there wasn't, by way of a '0'.
The next 2 boxes covered Internal Wiring.
If the first box had a '1' in it, the EU got the installation for free as it was classed as 'In-situ'. I can't be any clearer than that I'm afraid. There may well have been sundries such as a 'Connection fee' to cover Frames work and admin, but I reiterate, the 'In-Situ' component of the installation was free.
Regarding your other matter, it begins at 'Pleb level' (
) tomorrow. The tasks will be rolling out from then.