A 62,000-ton British battleship with fifteen heavy guns

How would other navies react to a British 62,000-ton battleship with fifteen 16.5-inch guns?

The imagined broadside would alarm rival navies, but producing it would require Britain to preserve far more construction capacity through the treaty years.

Assuming the hypothetical ship enters service around 1939, fifteen guns would probably occupy five triple turrets. Its broadside is expected to trouble Japan even against nine 18-inch guns because of the number of shells, total weight of fire, and anticipated loading rate. Germany's Scharnhorst and Gneisenau would be especially vulnerable in this assessment, with alarm also expected in America and Italy. Building more than one ship of this scale would depend on an industrial base that Britain had not maintained historically. The counterfactual therefore requires more construction during the treaty period and measures to prevent specialist firms or sections of the industry from disappearing. The proposal remains hypothetical, and the speed stated in the question is too unclear to identify securely.