Why Flower-class corvettes did not need 3.7-inch antiaircraft guns

Would a naval version of the British 3.7-inch antiaircraft gun improve the Flower class?

No clear need is identified: existing close-range weapons matched the intended threat, and Britain already had 4-inch dual-purpose mountings if it wanted more antiaircraft capability.

The Flower class is assessed against its intended Atlantic convoy work, where the routine aircraft threat included the Fw 200 Condor. Its forward 4-inch gun dealt with surface targets such as submarines, while pom-poms and, on some later ships, Bofors provided close antiaircraft defense. Some 4-inch mountings were dual purpose, but many were low angle. If stronger antiaircraft capability were required, an existing 4-inch dual-purpose mounting is suggested as the obvious British option. Navalizing the Army's 3.7-inch gun would add expense without a clear need in that mission.