Six Minutes to Midnight

The title of the film is nothing to do with the Doomsday Clock, which was not introduced until eight years after the events of the film, and is nothing to do with British Intelligence. As the character of Captain Drey explains in the film itself, it refers to Miller's Intelligence phone contact number which is Whitehall 1154.

On the beach waiting for the German plane, the two lines of schoolgirls are nowhere near far enough apart for the plane to land between them, but their flare-lit lines appear from the approaching plane's cockpit to be the proper width.