Mavis Batey

Mavis Lilian Batey, MBE (née Lever; 5 May 1921 – 12 November 2013), was an English code-breaker during World War II. Her work at Bletchley Park was one of the keys to the success of D-Day. She later became a garden historian, who campaigned to save historic parks and gardens, and an author.

Early life
Mavis Lilian Lever was born on 5 May 1921 in Dulwich to her seamstress mother and postal worker father. She was brought up in Norbury and went to Coloma Convent Girls' School in Croydon. She was studying German at University College, London at the outbreak of World War II, concentrating on the German romantics in particular.

Bletchley Park codebreakers
Initially employed by London Section to check the personal columns of The Times for coded spy messages, in 1940 she was recruited to work as a codebreaker at Bletchley Park. She worked as an assistant to Dilly Knox, and was closely involved in the decryption effort before the Battle of Matapan. According to The Daily Telegraph, she became so familiar with the styles of individual enemy operators that she could determine that two of them had a girlfriend called Rosa and this insight allowed her to develop a successful technique.

In December 1941 she broke a message between Belgrade and Berlin that enabled Knox's team to work out the wiring of the Abwehr Enigma, an Enigma machine previously thought to be unbreakable. While at Bletchley Park she met Keith Batey, a mathematician and fellow codebreaker whom she married in 1942.

Later life
Batey spent some time after 1945 in the Diplomatic Service, and then brought up three children. She published a number of books on garden history, as well as some relating to Bletchley Park, and served as President of the Garden History Society, of which she became Secretary in 1971.

She was awarded the Veitch Memorial Medal in 1985, and made a Member of the Order of the British Empire (MBE) in 1987, in both cases for her work on the preservation and conservation of gardens.

Batey, aged 92 and a widow since 2010, died on 12 November 2013.