While it's a interesting discussion, no single aircraft type saved Britain.
I would argue that one did. The Fairey Swordfish attack on the Italian fleet at Taranto was noted by the Japanese. Having seen the success that could be achieved by aircraft carriers attacking a naval fleet at anchor, they repeated it at Pearl Harbor. When news of their attack reached Churchill, he wrote in his diary ...."I knew the United States was in the War now up to the neck, so we had won after all."
It's an interesting thought.