It’s fair to say that there’s a lot of interesting stuff in the British Museum’s latest exhibition, Legion: Life in the Roman Army. In fact, if you’re into soldiers and emperors, conquest and battle, it will be right up your street. Even for the uninitiated, however, this is a seriously impressive show, with sundry ancient artefacts brought together in the Sainsbury Exhibition Galleries at the back of the Great Court to give a sense of life in the service of the emperor with all its glamour, danger and romance.