From my experience when we got our A346's.......
The senior training captains on the A343 fleet went to TLS
to be trained by Airbus so they could then train others within the company and got their hands on experience with the Airbus test pilots on the A346.
They then began some internal training once the a/c came online with the company. In our case they flew off to a quieter airfield and then took it in turns to fly circuits until everyone was confident with landing taxi-ing and taking off. Once there were enough pilots trained to operate the scheduled services, the rest that came online got trained on regular flights after completeing a 1-2 day classroom and sim based training course.
So in Iberia's case they maybe doing the same sort of thing as the pilots are already trained on the A343 so it's not that much differant on the A346.
"She Rolls, 45 knots, 90, 135, nose comes up to 20 degrees, she's airborne - She flies, Concorde Flies"