The Battle of Britain ended because Germany gave up trying.
They were prevented from achieving their objectives.
The 'heavy arm of diplomacy' failed.
It didn't work.
They stopped.
Britain won the battle because Germany stopped trying to win.
Whether they stopped trying because of other commitments, shortage of sausage, unsustainable losses or disagreements regarding the price of fish is irrelevant.
They stopped.
Britain therefore won.
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