Thursday 17 February 7.30pm at Plinston, SG6 3NX
John Harper visits the Garden City to present his fascinating illustrated talk, revealing the secrets behind Letchworth’s codebreaking heroics in World War II.
John recalls 10 years of hard work rebuilding a ‘Bombe’, a machine which decoded Germany’s secret messages during the war, capable of scrambling a code in 150,000,000,000,000,000,000 ways!