Lucy was the daughter of Reuben and Emily Shaw and sister of Liz. Whilst Liz pursued a career in science, Lucy embarked on one in the arts as Emily wished they both would. She had at least two children by the 1970s and was a lecturer of medieval church architecture at the University of Reading.
Emily was pleased with Lucy's career and was proud that she was "changing the face" of the subject, but was disappointed that she was teaching at a redbrick university. She had her first monograph, concerning misericords, published whilst Liz was working at UNIT.
When Liz asked their mother for advice, Emily remarked that Lucy would be surprised to hear that she had done so. She and her children met with Emily for lunch one weekend but Liz was too busy with Mars Probe 7 to join them. Emily chose not to tell her about the letters that members of her committee had been receiving foretelling their deaths.
Emily called Lucy and Reuben to say goodbye in "[her] own way" upon receiving her own letter, telling Liz that she would have to explain to them what had happened after she died. (AUDIO: The Last Post)
Like her mother, Lucy was an admirer of the arts and was familiar with quotations from plays such as Henry V which her sister was not. Emily did not tell Lucy about the letters as she knew that she would enter into hysterics whilst Liz was more level-headed. (AUDIO: The Last Post)