What fifty 16-inch battleships would do to the naval war

How would Britain use fifty 16-inch battleships in the Second World War?

They would overwhelm Italian and German surface opposition and disrupt Axis convoys, but Britain would struggle to crew them without retiring older ships.

This deliberately extreme Second World War counterfactual gives Britain fifty battleships armed with 16-inch guns. The resulting concentration of heavy firepower could finish attacks on the Italian fleet after Taranto and make Axis convoys to North Africa extremely difficult to sustain. Germany’s surface ships would likewise meet several British capital ships instead of isolated pursuers. Crewing this fleet would be a severe constraint, likely requiring the Royal Navy to retire older R-class battleships and strip personnel from other ships.