In 2018, she was awarded the Légion d’honneur – France’s highest military honour – in recognition of her service.
Ms Bourne said she gained “a little bit of personal satisfaction” from her role in anti-Nazi operations.
She remained unaware of Bletchley Park’s wider mission: “I only knew my bit,” she recalled, having been sworn to secrecy.
Ms Bourne’s grandchild Bee said: “It was our family’s privilege to share Ruth with the world.
“My grandmother was such a bright spark: intelligent, creative, and witty.
“She was always delighted to give her time to educating others about her codebreaking contributions at RAF Eastcote, and she volunteered for decades at Bletchley Park giving tours.
“She lives on in books, in her pottery and art, and in our memories. She will be dearly missed by all.”
She spent her latter years living in High Barnet, north London.
