In 1984, he played the existentialist philosopher Søren Kierkegaard in the "Prometheus Unbound" episode of Don Cupitt's Sea of Faith (TV series) for BBC.
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He played "with chilling authority" in the words of writer David Stuart Davies, Professor Moriarty in The Baker Street Boys (1982), and "with great panache" Inspector Lestrade in the Granada Television series The Adventures of Sherlock Holmes (featuring Jeremy Brett as Holmes).
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Rosalie Williams is best known for her appearance as Mrs. Hudson in The Adventures of Sherlock Holmes TV series produced by Granada Television from 1984 until 1994 alongside Jeremy Brett, David Burke, Edward Hardwicke, and Colin Jeavons.