Campaigners to bring petition to Downing Street, demanding all men convicted under gross indecency law for their homosexuality are pardoned

The family of the codebreaker Alan Turing will visit Downing Street on Monday to demand the government pardons 49,000 other men persecuted like him for their homosexuality.

Turing, whose work cracking the German military codes was vital to the British war effort against Nazi Germany, was convicted in 1952 of gross indecency with a 19-year-old man, was chemically castrated, and two years later died from cyanide poisoning in an apparent suicide.

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He was given a posthumous royal pardon in 2013 and campaigners want the government to pardon all the men convicted under the outdated law.

Turing’s great-nephew, Nevil Hunt, his great-niece, Rachel Barnes, and her son, Thomas, will hand over the petition, which attracted almost 500,000 signatures, to 10 Downing Street.

Ms Barnes said: “I consider it to be fair and just that everybody who was convicted under the Gross Indecency law is given a pardon. It is illogical that my great uncle has been the only one to be pardoned when so many were convicted of the same crime. I feel sure that Alan Turing would have also wanted justice for everybody.”

Matthew Todd, the editor of Attitude Magazine, who will also visit Downing Street, said: “Generations of gay and bisexual men were forced to live their lives in a state of terror.

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“Men convicted of gross indecency were often considered to have brought huge shame on their families and many took their own lives. We still live with the legacy of this period today and it’s about time the country addressed this appalling part of our history.”

Benedict Cumberbatch’s Oscar-nominated portrayal of Turing has brought the pioneering scientist’s story to a wider audience. The film follows him from his days as a second world war code breaker at Bletchley Park to his work at Manchester University, which saw him hailed as the father of modern computing, and his tragic death.

Turing led a team decoding messages at Bletchley Park, whose work remained secret until many years after the end of the war, and also designed the Bombe machine which decrypted German messages. Their work helped shorten the conflict and saved many thousands of lives.