British stockpiles in 1937: pom-poms, ASDIC, armor and radar

In 1937, which existing system should the Royal Navy stockpile in a warehouse for the coming war?

Dan chooses pom-poms, another participant favors depth charges and ASDIC, Dragon proposes battleship armor plate, and Alex chooses early radar sets.

Dan favors quad pom-poms for useful destroyers that would otherwise face heavy losses to aircraft early in the war. A competing proposal stocks depth charges and ASDIC equipment so ships can be fitted rapidly for submarine hunting, with the hope of killing experienced U-boat crews early. Dragon instead targets the shortage of battleship armor plate. Alex chooses early radar and recalls its unexpected usefulness against surfaced submarines and periscopes as well as aircraft. He suggests that warning time could change the losses of Courageous and Glorious, provided the equipment detected the threat soon enough for evasive action. These are competing stockpile choices within the 1937 technology restriction, and the six-pounder is rejected as too late.