Everyone seems to agree that a German invasion of Britain was impossible because of many redundant facts.
So why did Britain borrow so much money? Why take it so very seriously? Why was the popular perception one of an island under threat, when there were so many reasons that the population could have been told that invasion was impossible?
Was it just Churchill deciding that the Nazis were evil? Would a different Britain have reached a ceasefire, safe in the knowledge that it was safe for at least a few years?