One consideration is that much of Bletchley Park's efforts were kept hidden from the public until 1974[1] - it's possible that in 1979 the computer's role in br

One consideration is that much of Bletchley Park's efforts were kept hidden from the public until 1974[1] - it's possible that in 1979 the computer's role in breaking German cyphers was still not widespread knowledge. [1] https://en.wikipedia.org/wiki/Ultra#Postwar_disclosures https://en.wikipedia.org/wiki/Ultra#Postwar_disclosures