What if Hood suffered a catastrophic engine failure before fighting Bismarck?
Short answerAn early failure could keep Hood out and bring King George V alongside Prince of Wales, replacing the historical battle with a two-battleship pursuit.
NotesThe consequences depend on when Hood loses machinery. A failure during the battle forces immediate withdrawal, while an earlier breakdown would require a major refit and change the force dispatched against Bismarck. Prince of Wales would probably not be sent ahead alone if the problem emerged soon enough. King George V could join her instead, producing a two-fast-battleship engagement with an already worked-up flagship.