What if Britain had built Vanguards as fast as possible?
Short answerMore fast capital ships could alter the Bismarck hunt and ease pressure on Hood, though they would not remove battlefield uncertainty.
NotesThe answer assumes capital-ship construction is not paused and follows the consequences through availability, gun reliability, and task-group composition. Additional Vanguards could enter between the King George V-class ships and reduce the operational pressure placed on Hood. They could also create two fast covering groups with carrier support instead of one improvised interception force. Bismarck would still retain the possibility of a lucky hit, but Germany would face more reliable guns, more speed, and a much harder breakout problem.