Hunt worked as a Civil Service secretary in the 1960's. She informed Jack Harkness of the 456's offer: a cure for a flu epidemic in return for twelve children. She chose Jack to complete the handover as he didn't care for the children. Hunt was present at the handover and received the vaccine information on the 456 radio frequency.
In 2009, the order to kill her was sent out as Bridget Spears was given a blank page by the Home Office in connection with the return of the 456. She was killed shortly after. (TV: Children of Earth: Day Two}