An excellent episode of Dad's Army. It initially focusses on Walker's "business" dealing, never a bad thing to concentrate on. However, from a point the focus shifts to Lance Corporal Jones and his time in the Sudan.
A new recruit to the platoon, Private Clarke, makes some dramatic aspersions regarding Jones's character, based on his conduct during the lead-up to the Battle of Omdurman. Eventually, to clear his name, Jones recounts the events Clarke is referring to. This flashback is easily the highlight of the episode. Hysterically funny, with the characters in the flashback played by members of the platoon, often with some very amusing twists. Sergeant Wilson becomes the Colonel, Captain Mainwaring the profane, dialogue-censored Sergeant, Pike the delicate Lieutenant (well, only the rank has changed). Fraser and the Air Raid Warden are fiendish dervishes.
Add in some great puns and one-liners plus a pushing-the-envelope use of the word "Fakir" and it is incredibly funny. It also has a good ending.
The parallel with the films "The Four Feathers" are well explored, with Jones getting feathers and hate letters in the mail and footage from the 1939 version of The Four Feathers being used.