Spywatch - Season 1 Episode 3 Spies All Around

Amy's cows have escaped and it looks as if the fence has been cut. Norman, Dennis, and Polly suspect Grainger is to blame. Later, the whole village attends a lecture where Cyril Jenkins shows them a series of posters of people who may be spies in disguise, but one poster in particular startles Norman, Dennis and Polly; an image of a woman in half a Nazi uniform and half normal clothing stays in their minds. Meanwhile, in the present, Norman decides to track down Polly.