I believe that the events were already overtaking the introduction of the Vulcan into Argentine service, had agreement been reached.
This weekend I will be seeing an engineering Argentine officer who would have been part of the team that would have involved in this purchase, he previously had been involved in the Dagger acquisition from Israel (and a very interesting story that is too - for example they had asked all the aircraft to be stripped and repainted - they did the first and the rest were just overpainted). I will see if I can find out more.