Perfectly factual advertisement, what's the fuss?
"Janet Carolin (or Caroline) Hughes was born on 4 March 1921. She... attended Miss Ironside's School for Girls in Kensington, trained as a ballet dancer, and was admitted to the Royal Ballet School..."
Moving on a little:
"...in 1940, at the age of 18, she was interviewed by senior codebreaker Stuart Milner-Barry, and joined the secret codebreaking project at Bletchley Park"
https://en.wikipedia.org/wiki/Jane_Fawcett
After the war she packed in Codebreaking for a more fulfilling career with a long term future... as an opera singer.