This is an extremely interesting, thorough and well-written book which deals with the relationship between Britain and the rest of Europe, as well as the role of Christianity in the development of these bonds. Under the current circumstances this could not be more topical, as the European Union is evolving towards a more supranational model, despite the difficulties faced after the rejection of the Constitutional Treaty. Recently this has been remedied by the enactment of the Reform Treaty, signed in December 2007 by the heads of government or state of the twenty-seven EU countries. The whole debate about the need for a referendum in the UK shows the heated nature of this topic. This book, divided into nine chapters, including a very detailed introduction and a systematic conclusion, focuses upon the role of the different Christian Churches during the Great War and the Second World War, as well as the establishment of the European Economic Community and subsequently the European Union in the second half of the twentieth century. Furthermore, it deals efficiently with the unease on the part of the UK about further integration after having decided to join the European Communities on mainly economic grounds. The chapter on Christians and the Common Market seems particularly relevant, as it explores the move from neutrality towards Europhilia amongst British Christians in the '60s. Salter's vision of a Europe not only united, but in a federal form, is particularly refreshing and the study of his contribution to the European project is excellent. Having said that, after the referendum on the British membership of the European communities, British Christians have only maintained a sporadic interest in the process of integration and, as Hugh Wilcox states, ‘in the British Churches’ allocation of resources, international affairs comes at the bottom of the list'. The interdisciplinary approach of Britannia, Europa and Christendom should be praised, although a more detailed analysis of the legal sources concerning religion (for example the Treaty of Amsterdam) would have been beneficial. The reflection – contained in the conclusion – about the roles of different Churches in European society at the beginning of the twenty-first century, at a time when Churches seem to be losing the traditional role that they played in the past, is provocative and inspiring. There is no doubt that this book is timely and provocative and I have no hesitation in recommending it to all scholars with an interest in law, sociology, history and religion.