10/28/1998 AD died
Flowers dies aged 92, leaving a wife and two sons.
After the war, Flowers received little recognition for his contribution to cryptanalysis.
Flowers was left in debt after the war after using his own personal funds to build Colossus. The government granted him £1,000 payment which did not cover Flowers' personal investment in the equipment; he shared much of the money amongst the staff who had helped him build and test Colossus. Flowers applied for a loan from the Bank of England to build another machine like Colossus but was denied the loan because the bank did not believe that such a machine could work. He could not argue that he had already designed and built many of these machines because his work on Colossus was covered by the Official Secrets Act. He remained at the Post Office Research Station where he was Head of the Switching Division. He and his group pioneered work on all-electronic telephone exchanges, completing a basic design by about 1950, which led on to the Highgate Wood Telephone Exchange. He was also involved in the development of ERNIE.[18] In 1964, he became head of the advanced development at Standard Telephones and Cables Ltd.,[19] where he continued to develop electronic telephone switching including a pulse amplitude modulation exchange, retiring in 1969.
It was not until the 1970s that Flowers' work in computing was fully acknowledged. His family had known only that he had done some 'secret and important' work.
In 1976, he published Introduction to Exchange Systems, a book on the engineering principles of telephone exchanges.
