Jonathan Freedland explores parallels between Brexit and a major dispute between King Offa of Mercia and Charlemagne, King of the Franks in the 790s. In the 790s, King Offa of the English kingdom of Mercia found himself at loggerheads with Charlemagne, King of the Franks on the other side of the Channel. Jonathan and guests examine how the dispute was resolved and explore how the difficulties compare to Britain's relations with the EU in the postwar era. Jonathan is joined by historian Dr Rory Naismith of King's College London and Sir Stephen Wall, former Private Secretary to John Major and former Europe advisor to Tony Blair. Stephen Wall was also Britain's ambassador to the EU in the late 1990s and is the author of an official history of Britain's relations with the European Community 1963-75. Produce: Laurence Grissell