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Harry Fensom

Harry William Fensom (4 February 1921 – 1 November 2010) was an English electronic engineer with the GPO. During World War II he worked with Tommy Flowers at Bletchley Park on Colossus, the world's first programmable electronic computer,that decoded encrypted German messages using the Lorenz cipher.After the war, he worked on ERNIE, a machine based on Colossus engineering that was used to generate bond numbers for the Premium Bond draw,

Early life and education

Harry was born in Catford, in South London. Shortly after his birth the family moved to Fife Scotland where they stayed until 1928. His secondary education was at the Royal Liberty School in Gidea Park where he excelled in Mathematics and the Sciences. He left school at 16, shunning a university education in favour of finding work. Whilst working for the GPO as an engineer, Harry continued his education at night school, studying for City and Guilds at East Ham, Borough and Northampton polytechnics.

World War II

In 1942, Harry was sent to work at Dollis Hill Research Station with Tommy Flowers, Sidney Broadhurst and William Chandler. He began working on projects connected to the Enigma machine. Other projects included the Nightingale the Tunny and the Heath Robinson. Harry's work took him increasingly to Bletchley Park and in December 1943 the first Colossus machine was installed at Bletchley Park to decode the messages from the Lorenz machine. The Mark II Colossus was installed on June 1, 1944 in time for the D-day landings on June 6.

Sir Harry Hinsley, as the official historian, in his book 'British Intelligence in the Second World War' gave his opinion that the breaking of the Enigma and Lorenz codes shortened the war by at least two years and saved hundreds of thousands of lives.

Post war activity

After the war, Harry continued to work for the GPO at Dollis Hill. In 1957 he was given charge by Sydney Broadhurst of the system design of a machine called ERNIE, which was to be used to deliver the winning numbers of the prizes for the Premium Bonds.