Subnational government in southern England and northern France have long engaged in cross-border cooperation, aiming to learn from each other, shape European policy and tackle common policy problems. While cross-border cooperation in the EU is common, the English Channel represents an interesting case; the border is not only ‘administrative’, but physical. Language, administrative tradition and cultural values also differ. Cross-border cooperation across the Channel thus represents a unique phenomenon. This paper charts the development of this cooperation, outlining its evolution from bilateral networking to a more complex and networked form of cross-border governance. This case challenges existing assumptions that historical/cultural/linguistic/administrative commonalities are prerequisites for effective cooperation. Rather the importance of local leaders and convergent policy priorities in fostering cooperation is emphasized. This case further highlights how cross-border governance can be built outside of formal instruments, such as the EGTC, suggesting subnational authorities adopt ‘flexible’ approaches to their transnational activities.