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[bilbokitz]

True.

Not games, but the now not so younger members of the clan may say different but I will leave it as is.

[burakkucat]

A wise decision. 

[WWWombat]

Vectoring would work just as well for a single line if all the other lines were vectoring friendly.

Ooh. Good point. I guess it would.

Wouldn't that mean that all lines are in a synchronised vectoring group, and that the vectoring engine is calculating all the impacts of the other lines into the single "upgraded" line? But not bothering to add those same impacts into the N lines that haven't upgraded?

Would you be paying the penalty of vectoring (such as long sync times), without gaining much?

[bilbokitz]

Does this mean vectoring may well have been enabled before, in vectoring friendly mode with no speed benefit , this mode not reported by the modem?

This would tie in with "we have changed the vectored profile"

[j0hn]

No, it just means when vectoring is enabled that you would still see the benefit if other lines were "vectoring friendly" and didn't fully support vectoring.

You had a modem that supported vectoring, with it enabled at your end. In my opinion the DSLAM was simply not enabled. The ISP had incorrectly advised you.

[ejs]

Does this mean vectoring may well have been enabled before, in vectoring friendly mode with no speed benefit , this mode not reported by the modem?

Yes, this was one possibility, with vectoring enabled on the DSLAM, but with some lines operating in vectoring friendly mode.

[bilbokitz]

Not directly related, theoretical question.

If a line is synced at 80 and the isp is offering 80 down, could openreach still limit bandwidth to 40 mbps?

[j0hn]

OpenReach limit their products by sync rate only as far as I'm aware.
OpenReach only control part of the connection though. The ISP/backhaul provider could be limiting a line. This can be deliberately or something somewhere could be configured incorrectly.

[WWWombat]

Openreach shapes traffic for congestion - if the link between the cabinet and the OLT at the fibre head-end is overloaded.

The priority rate is, IIRC, lower than 40Mbps. But, because this depends on other lines being active, I doubt you'd see any consistent speed value.