Not horror, Beef. It was a wartime propaganda film released as a feature, about a village taken over by undercover agents helping a German invasion. Brilliantly done, as well.
Yeah, written by Graham Greene, who has been the inspiration for many classic films...The Third Man, Brighton Rock, The Power and the Glory to name a few...I particularly love the original of Brighton Rock with Richard Attenborough playing the lead role as Pinky...really menacing.
[video=youtube;bCgfhZjdGk8]http://www.youtube.com/watch?v=bCgfhZjdGk8[/video]

