Pete and Dud were characters played by the comedians and entertainers Peter Cook and Dudley Moore.
The dialogue format originated in 1964, when Dudley Moore invited Peter Cook to appear in a television performance. Cook scripted a conversation between two men from Dagenham wearing flat caps. This proved to be very popular with television audiences and the partnership was continued during the series Not Only... But Also.
Pete is a know-it-all and would-be intellectual, very much in the spirit of E. L. Wisty, and Dud is a put-upon Herbert in a subservient role, who tries to impress Pete with his knowledge. Neither of them has any real sense.
The "Dagenham Dialogues" between the two ranged from paintings in toilets (Pete finds the Mona Lisa snooty), how the bottoms of Rubens's nudes seem to follow you around the room, reasons why geckos don't live long and being annoyed by film stars (including "bloody Greta Garbo" and "bloody Anna Magnani") pestering them for romance.
During the 1970s Cook and Moore used a similar formula for the more adult Derek and Clive recordings.
The comic and personal relationship between Cook and Moore is the subject of the play Pete and Dud: Come Again, by Chris Bartlett and Nick Awde.