Hi Edmund,
I still haven't found that footage of the Mirage crashing. Further to The Claw's post of radar ops. The following thread has one of the Argentine radar ops as a poster. He also has access to a small group of Argentine veterans who are researching the conflict. It might give further info as to the radio conversation that took place between Garcia Cuerva and Argentine controllers?
Falklands "What if...?" - Key Publishing Ltd Aviation Forums