Dad's Army: The Lost Episodes S01E01 - The Loneliness of the Long Distance Walker

Private Walker, source of the platoon's supplies of whisky, cigarettes and other essential black-market goods, is called up to serve in the regular Army, so Mainwaring decides to use all his standing as an officer and a bank manager to have him excused from military service. Meanwhile, Jones and the others try to ensure that Walker fails his medical.