Who in London instructed the Royal Navy to intervene at Algeciras?
Short answerThe prime minister passed the matter to the First Lord of the Admiralty, who signalled the fleet command already positioned near the conference.
NotesThe civil-military chain converted a diplomatic warning into visible naval action. A message reached the prime minister, passed to the First Lord of the Admiralty, and then went by radio to the Mediterranean command. The Atlantic and Mediterranean fleets were already exercising nearby, with additional reserve ships prepared for use. The speed of the demonstration therefore depended on political authorization and prior military positioning working together.