For almost 30 years, the codebreakers at Bletchley Park kept their crucial contribution to the Allied war effort secret until declassification. Among the cryptographers who cracked Nazi Germany’s Enigma code during World War 2 was Alan Turing. Article continues below ADVERTISEMENT Appointed team leader by Winston Churchill, he was provided the £100,000 construction cost for a deciphering machine called Christopher. The British mathematician was played by Benedict Cumberbatch in the 2014 biopic The Imitation Game, which is on TV this Easter weekend. The biographical thriller boasts an impressive cast including Keira Knightley, Matthew Goode, Mark Strong, Rory Kinnear and Charles...