Grytpype-Thynne is the smooth spoken and sophisticated principal villain on the show, and is usually accompanied by his companion in crime, Count Jim Moriarty.
For instance in "The Dreaded Batter Pudding Hurler of Bexhill-on-Sea" he is a police inspector; in "The Whistling Spy Enigma" he is the secret Government agent who sends Neddie Seagoon to Hungary to booby-trap the boots of the national football team; and in "The Jet-Propelled Guided NAAFI" he is Prime Minister Neddie's butler and confidant, but also an undercover Soviet agent plotting with Moriarty to sell the guided NAAFI secrets to the Russians.
In later series, he and Moriarty are much further down the respectability scale, often found sharing the same suit, eating newspaper stew, or living up trees, in dustbins, in open drains, or on top of disused factory chimneys.
This happened most notably in "Rommel's Treasure", "The Great International Christmas Pudding" and "Napoleon's Piano".
Grytpype-Thynne often used the word "Charlie" (meaning a foolish or easily duped person) to refer to people (often Neddie Seagoon).