Update... since starting this thread this morning - we're now appearing on the Openreach Broadband Checker as 1000Mbps Available. This would suggest the Gold Key has been applied.
Now to attempt to takeover the line, which appears to be a standard process as suggested.
Thanks again, all! Seems it was just a waiting game.
Nice! Good luck!
Let us know how it goes.
I think it can take up to midnight for new services to be activated on the day, but often it's sooner with no disruption longer than a few minutes. That's how it was always said to me when I signed up for internet anyway!