Dad's Army S03 E13 No Spring for Frazer

During weapons inspection, Mainwaring scolds Frazer for losing a single spring, rendering the Lewis gun useless, and HQ has no spare parts, so even a court-martial may follow. Frazer believes a coffin has been delivered to the funeral parlour, where the men discover it's at Mr Bluett's surviving brother's home. The hilarious treasure hunt continues even after the burial.