After her acting career ended, Flanagan remained in the public eye, owing to her association with the Kray Twins and her efforts to secure their release. Her involvement with the Kray family went back to her time as hairdresser for the twins' mother Violet. She also wrote the book Intimate Secrets of an Escort Girl (Everest books, 1974). The book was serialized in the magazine Tit-Bits, accompanied by a blurb which said “Britain’s most photographed model lays bare the facts of her working life in the sauciest story of the year.” Her memoir, One of the Family, was published in 2015.
