Work in the pathology department was disrupted for a few days in July 1944 (and a number of people killed) when the hospital suffered a direct hit from a V1 flying bomb. By the end of the war, she was in charge of pathology at the Royal Free and had established the first Haematology Department there. After her retirement, Lucy Wills travelled extensively, including to Jamaica, Fiji and South Africa, continuing her observations on nutrition and anaemia.