Checking the premise of a British 5-inch gun question

Why did Britain treat the US 5-inch/54 Mark 42 as an interim step toward a higher-velocity 5-inch/70 weapon?

The panel challenges the premise, saying Britain does not appear to have adopted that US gun as its interim path and was instead considering its own 5-inch work while retaining the 4.5-inch standard.

The first response assumes a desire for higher velocity, but the panel then recognizes that the Mark 42 was an American weapon. Britain probably did not treat it as the proposed interim system; the discussion instead recalls separate British 5-inch studies alongside continued reliance on the 4.5-inch gun. The correction shows why national design lineages need to be established before explaining a procurement decision.