Hunter no matter how you look at it, it was a British Victory. Who cares about number of aircraft destroyed or civilians killed. It was a victory for the British.
Did the British prevent the Germans from destroying the RAF? Yes.
Did the British prevent the Germans from destroying the British factories? Yes.
Did the Germans invade England? No.
Therefore it was a British Victory.
Did the British prevent the Germans from destroying the RAF? Yes.
Did the British prevent the Germans from destroying the British factories? Yes.
Did the Germans invade England? No.
Therefore it was a British Victory.