If Admiral Lee could warn Hood's command before the Battle of the Denmark Strait, how might the British fight differently?
Short answerIf the warning were believed, Holland could change Hood's approach and bring King George V and carrier support into better position before contact.
NotesAn impossible time-travel premise tests how actionable foreknowledge could change an operation. An unknown American admiral appearing aboard Hood would probably be detained unless Admiral Holland recognized and believed him. With credible information roughly a day before the battle, the British could position for the known German route and call King George V and an aircraft carrier closer. Holland could also alter Hood's bearing and maneuvering to avoid reproducing the historical geometry of the fatal hit. Intelligence changes force concentration and initial conditions, but only after commanders establish that the warning is trustworthy.