Clare Balding joins a group of women in Oxfordshire, who meet every year to remember their friend Catherine, who died of breast cancer at forty-five. Some in the group knew each other before Catherine's death; others have met, and become good friends since. There are her friends from her school days, her book club and from her career as a nurse. Catherine would have been fifty this year and her daughter Sarah now sixteen explains how she has derived comfort from helping to raise money for research into the disease and by getting together with her mother's friends to share memories while walking together. Producer Lucy Lunt.