Foyle's War
This is a war series, set in England during WWII. The series centers around an aging detective, with a dry English wit, and an unassuming manner. Each episode (there are five sets in the Foyle’s War series and each set has four episodes in it) involves a murder mystery.
There is an assortment of likable characters that appear throughout the series.
Some of the British dialect is at times difficult to decipher. The movies would also have appeal for history students.