It strikes me that it was a combination of Fighter Command's prevention of Johnny Foreigner gaining air superiority over the English Channel and the brooding presence of the Royal Navy's Home Fleet at Scapa that kept Britain British when it mattered. Adolf certainly wasn't worried about the ability of the British Army, for the pongoes were busy nursing their wounds, having abandoned their unsuitable equipment and hitched a ride back to Blighty aboard anything that could get alongside at Dunkirk.
But that's all been forgotten.
Until the next time.
When we'll have to throw in the towel at the first push.