Britain's decision to leave the European Union was perhaps the most divisive and consequential event of modern British politics. To assess its impact on the tenth anniversary of the referendum, Anthony Seldon assembles an unparalleled list of writers from all sides of the debate – including Brexit MP Steve Baker, ex-Cabinet Secretary Simon Case, election guru John Curtice, economist Paul Johnson, ex-Foreign Secretary David Miliband, ex-Cabinet minister Emily Thornberry, leading lawyers Marina Wheeler and Jonathan Sumption and ex-Archbishop of Canterbury Rowan Williams. They analyse why the referendum happened, how Brexit became law and its impact on every corner of British life, concluding with a range of perspectives on how Britain might make the most of the opportunities now available to it. As the dust continues to settle, The Brexit Effect delivers a vital and timely analysis for all who wish to understand Britain's past, present and future.

Sir Anthony Seldon is the country's top political historian and acknowledged national authority on all matters to do with the government and No. 10. His book Churchill's Indian Summer: The Conservative Government, 1951–55 (1981) was published forty years ago, and since then he has written or edited many books, including The Blair Effect, 2001–5 (Cambridge, 2005), The Coalition Effect, 2010–2015 (Cambridge, 2015), The Conservative Effect, 2010–2024 (Cambridge, 2024) and The Impossible Office (Cambridge, 2024). He has been the honorary historian at No. 10 Downing Street and chair of the National Archives Trust, and has interviewed virtually all senior figures who have worked in No. 10 in the last fifty years.