Not Going Out · Episode 6x9 'The House'

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Lee invites Lucy and her parents and Daisy for Christmas at his late aunt Maureen's country house, which appears haunted though Lee tidies it up, burning a rocking-chair. This seemingly housed the ghost of a young boy and in the night ghostly music is heard - though it turns out to be provided by Lee's father Frank. Between them they discover the identity of the 'ghost', a childhood friend of Lee called Ralph - or so they think until Frank provides the answer to their questions.