Recent developments in the reading of Iron Age British coin-legends have added considerably to our knowledge of Latin in pre-conquest Britain. The picture that is now emerging is of the nuanced and sophisticated use of Latin over quite a wide area of South-Eastern England from the late first century B.C. onwards. The question that then arises is what the implications of this material are for our understanding of key developments in the culture, politics and societies of South-Eastern England in the decades before the Roman invasion. This paper argues that they are really rather significant.