In contrast to the field's predominant focus on teacher-led talk in reading contexts, this study considers child-led relaxed conversations about texts. It examines what is afforded by the occurrence of such relaxed book talk and how this is enabled with young children in school. Data are drawn from a co-participative study with four teachers in England that captured naturalistic video observations. The paper offers novel insights about the social and personal affordances of informal book talk, the role it can play in developing positive dispositions towards reading and the salience of familiar texts and the classroom reading culture.