The Bank of England unveiled the design of a new banknote celebrating mathematician Alan Turing, who helped Britain win World War Two with his code-breaking skills but is believed to have killed himself after being convicted for having sex with a male partner.

The new 50-pound note features an image of Turing, mathematical formulae from a 1936 paper he wrote that laid the groundwork for modern computer science, and technical drawings for the machines used to decipher the Enigma code...