Could Yamato intelligence have given King George V 16-inch guns?

Would Britain have built King George V with three triple 16-inch turrets if it had known about Yamato?

Probably, if that knowledge made the 14-inch treaty limit untenable. Nelson-class turret designs could have provided a starting point.

Knowledge of Yamato could have undermined the case for a 14-inch limit before the King George V design was settled. In that counterfactual, a battery of three triple 16-inch turrets is considered plausible. Britain could have revisited the Nelson and Rodney turret designs and adapted them. No such redesign is claimed to have been ordered.