What could the Royal Navy use to intercept the Nakajima G10N or Fugaku?
Short answerRadar would place high-flying fighters for a diving interception when the bomber descended to an altitude from which it could bomb effectively.
NotesThe proposed Japanese ultra-long-range bombers had impressive paper specifications, but neither reached service. Had such aircraft appeared, Royal Navy air defense would have used radar to position Sea Furies or Firebrands for a diving interception when the bombers descended to a useful release altitude. Remaining near the claimed maximum ceiling would make accurate bombing highly doubtful.