This article argues that the history of mass education as it was written in Great Britain between 1870 and 1914 became an important site for debating what it meant to be British and the nature of progress. In particular, it explores different perspectives on when and where to begin a history of mass education, whom or what to make central to it, and what guidance the past offered for the future. Disagreements over these seemingly narrow questions reflected broader disagreements about what it meant to be British (including whether there was a deep-seated national character at all); the nature of the union; and how and why progress happened.