Catch up TV on The Arbor. Watch the latest and all other episodes of The Arbor now online, broadcast on ABC1. Catch up on your favorite ABC1 TV show: The Arbor. Replay tv on its best! The Arbor traces the tormented life and legacy of British playwright Andrea Dunbar. The documentary follows her eldest daughter Lorraine, as she comes to terms with her own struggles and those faced by her mother.