Was Britain technically capable of building triple-gun battleship turrets?
Short answerYes; it designed such turrets for Russia and studied them at home, but strategic and political calculations discouraged their wider adoption.
NotesBritish-designed triple turrets for Russian ships, followed by G3 and Nelson work, demonstrate the country's technical competence. Designers sometimes restrained their proposals because a very fast ship with unusually heavy armament could intensify the naval arms race. Doctrine also favored speed and confidence in British gunnery over matching the largest possible American broadsides gun for gun. The limited adoption of triple turrets therefore reflected strategic and political calculation rather than a missing capability.