The Avengers.S06E24.Fog

The Gaslight Ghoul, a Victorian mass murderer similar to Jack the Ripper, strikes again a century later. In a fog-shrouded London, the Ghoul is intent on assassinating all the foreign delegates attending the international disarmament conference. Steed invents a fictitious additional Gaslight Ghoul murder in order to investigate a gentlemen's club, dedicated to uncovering the identity of the Ghoul, which Steed suspects is involved in the new killings.
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Teleplay by Jeremy Burnham
Directed by John Hough
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Guest Starring: Nigel Green, Guy Rolfe, Terence Brady, Paul Whitsun-Jones, Norman Chappell, Patsy Smart, John Garrie, Frederick Peisley, Arnold Diamond, John Barrard