The Avengers.S05E13.A Funny Thing Happened on the Way to the Station

In a spoof of the movie "The Lady Vanishes", a bride and groom keep catching the same railway train, to a station that doesn't exist. Steed starts to suspect that a novel espionage network is being created when the agent following them vanishes.
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Teleplay by Brian Clemens
Directed by John Krish
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Guest Starring: James Hayter, John Laurie, Drewe Henley, Isla Blair, Tim Barrett, Richard Caldicot, Dyson Lovell, Michael Nightingale