Doing a little research tonight and came across this bit from the British Film Institute. Looking at lovely London today - hard to believe it was once, not so long ago, right there on the brink.
I'm not sure when America got a look at this effective little film - it must have been just as the U.S. was getting in officially in December 1941. It had me at the opening title ("The Ministry of Information Presents!") It does make you think what might have been if Britain hadn't hung in as it did...