Perfect British naval gunnery from 1939

What if every British naval and anti-aircraft shell had perfect accuracy from 1939?

The imagined accuracy would bring much heavier German and Italian naval losses; repeated hits on the same spot are expected to weaken armor that could resist an isolated shell.

Renown's encounter with Scharnhorst and Gneisenau becomes an immediate German disaster, while Norway and Mediterranean battles impose much heavier Axis losses. Repeated shells hitting the same point are expected to compound that advantage by progressively damaging the armor. Even a cruiser firing smaller shells becomes dangerous when every round concentrates damage on the same section of a battleship. This argument assumes the magical accuracy in the question and supplies no calculation of how many real hits would defeat a given armor plate.