"The details of this algorithm were shared by the BND within Maximator with TIVC. This enabled the Dutch to read Argentinian naval and diplomatic communications before the war started. As reported by Aldrich and Wiebes, the British SIGINT organisation GCHQ had neglected Argentina. It was not able to read communications secured by Crypto AG devices. When the war started, it asked, under pressure, countries on the European continent for help. A directly involved Dutch source states that at that stage a specialist from TIVC travelled to GCHQ and explained how the HC500 Crypto AG devices for Argentinian naval and diplomatic communications worked; subsequent solution of the ciphers was left to GCHQ itself."
Nice going GCHQ!