How did the roles of the First and Third Sea Lords differ?
Short answerThe First Sea Lord led the Navy and operations; the Third Sea Lord controlled shipbuilding and procurement with the naval construction staff.
NotesThe First Sea Lord was the senior naval officer responsible for global operations and advice to the prime minister and the civilian First Lord of the Admiralty. The Third Sea Lord managed the material fleet, including ship proposals, construction programs, and important design-related exercises. The Director of Naval Construction supplied the Admiralty's senior naval-architecture expertise. Henderson's work with Stanley Goodall linked operational ideas to design and procurement.