On her return to London in 1923, Princess Arthur resumed her nursing career at University College Hospital, where she was known as "Nurse Marjorie", and subsequently at Charing Cross Hospital. At this time she was specializing in surgery, proving herself a competent, dependable, and imperturbable theatre sister, who was capable of performing minor operations herself and of instructing juniors in their duties. Her services to the nursing profession were recognized in July 1925, when she was awarded the badge of the Royal Red Cross by George V.