Shows like The Night Manager:
British Espionage Thrillers
Welcome to the U.K., a nation full of clever spies, political conspiracies, and dangerous enemies--both foreign and domestic--all of whom have great accents. Chock full of MI-5 and MI-6 spies who don't need to hide their identity because everyone is too polite to inquire. Be sure to check out The Night Manager, The Game, and London Spy for excellent recent series.