The Avengers.S04E22.What the Butler Saw

Steed enlists at a butler training school to find out who is selling military secrets to the enemy.
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Teleplay by Brian Clemens
Directed by Bill Bain
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Guest Starring: Denis Quilley, John Le Mesurier, Thorley Walters, Kynaston Reeves, Howard Marion-Crawford, Humphrey Lestocq, Ewan Hooper

Note: Lamp stands shaped like Minoan bulls used to decorate Miles's bachelor pad, designed by Harry Pottle, started retailing in a department in London six months after the episode was aired and have been cited as having "overtones of virility and eroticism and evidently considered highly saleable".