A British 14-inch step before the war

What if the Grand Fleet adopted Vickers 14-inch guns instead of 13.5-inch guns?

The caliber change could shift the entire British capital-ship sequence and later modernization choices.

Moving directly from 12-inch to 14-inch guns would complicate British ammunition logistics, although the change would be manageable. The next step could then produce 16-inch Queen Elizabeths, R-class ships, and Hood rather than another half-inch increase. A fleet already rich in 16-inch ships might remove the need to build Nelson and Rodney under the same logic as history. Treaty calculations could instead keep Tiger and the 14-inch Iron Duke class in service. Iron Duke's dimensions and central turret leave more room for an interwar reconstruction than the tightly arranged R class, because removing the middle turret could free weight and volume for machinery, armour, secondary guns, or aircraft facilities. One early calibre decision can cascade through construction, treaty retention, and modernisation decades later.