Writers Gill Hornby and Paul Burston talk about favourite books with Harriett Gilbert. Gill chooses Commonwealth by Ann Patchett, which traces the lives of six step-siblings over a span of 50 years. Paul loves Armistead Maupin's Tales of the City, which helped him come out to his parents as a young man. Harriett's choice is Tin Man by Sarah Winman, which describes the relationship between two men and a woman