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Audio book downloads have increased to £6 million of business this year. But why is there sometimes still a feeling that you're 'cheating' if you listen to a book rather than read one? Mariella Frostrup talks to Matthew Rubery and Mark McCree from the Royal National Institute of Blind People (RNIB) about the untold history of the audio book.

First broadcast on Open Book, 27 November 2016.