its uncertain the navy could have been a decisive factor in blocking the invasion, however valiantly it would have tried to delay it
once the germans had air supremacy over the south of england (and most of the rest of england presumably therefore), any major shipping action by the British in the channel would have been easy prey to torpedo attack and dive bombers
whatever glorious action the British navy had in the previous locations mentioned (except for dunkirk which was a special case, because the germans largely delayed their final push including massive air commitments on channel shipping and evacuating troops on the beaches), the British navy in those other events was able to have those success only because neither force could have a significant permanent number of planes over their enemy, or have exclusive air dominance)
iirc wherever navy action was a dominant in ww2, it almost always meant it was far out of reach of enemy lands (except of course in the pacific where the aircraft carrier strategy was decisive in naval battles, but even there yet again whomever had air supremacy or dominance over enemy shipping, it could pretty much sink them at will)
i more or less concur with the current main view of history, Brittan might have "won" BoB, but it was largely because of german mistakes (not constantly targeting radar, switching from enemy airfield targets to civilian terror attacks etc..). the 6 months delay it caused in a potential invasion also allowed the evacuated troops to get reorganized, and then potentially be able to repel the invading forces (also uncertain, but more plausible then the navy doing it on its own).
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