How continuous destroyer building could accelerate the 4.5-inch gun

What gun would British early-1930s destroyers use if treaty limits did not suppress construction?

They would probably begin with 4.7-inch guns, but sustained orders could bring the 4.5-inch gun into service earlier.

Early-1930s destroyers would initially continue using the 4.7-inch gun already associated with the type. A larger and steadier building programme would create more money and operational demand for improved destroyer weapons. An earlier 4.5-inch gun is therefore plausible. The outcome remains uncertain because it depends on further design and procurement decisions beyond the initial change in ship numbers.