Henderson's 15-inch/45 alternative for King George V

When was the British 15-inch/45 considered, and what would choosing it for the King George V class have changed?

It was a contemporary alternative to the 14-inch gun; Henderson believed nine 15-inch/45s could be ready without delay and could support wider fleet standardization.

The 15-inch/45 was considered alongside the 14-inch weapon selected for the King George V class. Henderson argued that three triple turrets could be made available without delaying the battleship program. He would also have used the new weapon to upgrade other compatible capital ships. Apart from Nelson and Rodney, that path could leave most of the Royal Navy battle fleet drawing on a common 15-inch ammunition supply, giving the design choice a major logistical payoff.