A Regional Organised Crime Unit (ROCU) in the UK is a specialist police body, formed by local forces, to tackle serious cross-border organised crime (SOC) like cybercrime, trafficking, and fraud, by sharing intelligence, resources, and tactics with the National Crime Agency (NCA) and other partners to disrupt criminal networks across regions. They provide regional expertise and specialist capabilities (like cyber teams) that individual forces lack, coordinating efforts to protect communities from complex criminal threats.