Replacing Hood's Vickers anti-aircraft mounts

What would probably replace Hood's five quadruple Vickers .50-calibre machine-gun mounts?

The British would probably use 20 mm Oerlikons or 40 mm pom-poms.

Hood carried five quadruple .50-calibre Vickers mounts. The two British wartime alternatives most likely to replace them were 20 mm Oerlikons and 40 mm pom-poms. Either choice would move the ship away from rifle-calibre machine guns toward heavier close-range anti-aircraft fire. Those weapons provide a plausible equipment path for a Hood refit.