Jan Chappell (born Janet Isabel Chappell 19 December 1949 in Fitzrovia, London) is a British actress, known for her portrayal of Cally in the first three series of Blake's 7. She trained at the Royal Academy of Dramatic Art (1963–65) where she received an honours diploma and the Kendal and Jenny Laird Prize. Her television appearances include The Naked Civil Servant, Reilly, Ace of Spies, Mr.