Would Britain's earlier battleships use 14-inch, 15-inch, or 16-inch guns?

Would Britain's earlier battleships use 14-inch, 15-inch, or 16-inch guns?

Matching foreign gun calibres points toward 16 inches, while the preferred alternative uses Britain's available 15-inch options.

The choice depends on the purpose of the new British class. Matching the gun calibre of foreign counterparts points toward 16-inch weapons. The preferred alternative in this scenario exploits the advantages of a 15-inch design. Either choice belongs to construction beginning around 1930-31, several years before the historical 1936-37 decisions.