Beetle,
As justifiably proud as you are of Britain's Finest Hour, you weren't fighting totally alone during the summer of 1940. A substantial number of the pilots who fought in the Battle of Britain were foreigners: Poles, Czechs, French, Americans, Belgians, and several others.
In addition, Roosevelt's administration was doing everything it could, in the face of opposition from a powerful isolationist and pacifist movement, to funnel arms, ammunition, and fuel to England.
So you get 3 million American tourists a year in England eh? So what. Arkansas, the smallest state west of the Mississippi, and one of the poorest, gets over a million tourists a year. Neener neener neener.
I've been to London twice. Nice place...but there aren't enough trees, there are too many people, and you can't hunt in the city limits. How uncivilized.
Regards, Shuckins