What would the 40 mm Toadstool system have changed?

What effect would Royal Navy deployment of the 40 mm Toadstool close-in weapon have had?

It could have destroyed much of the attacking air force in the Mediterranean because that close-in defense role was exactly what Toadstool was designed for.

The system was designed to destroy attacking aircraft at close range. If fielded in the scenario posed, it would have removed much of the air threat facing Royal Navy ships in the Mediterranean. The judgment is conditional on the counterfactual deployment and does not claim that the system transformed actual wartime operations. A weapon developed for close defense could have changed fleet survivability in an air-contested theater.