The Avengers.S06E07.False Witness

When all the witnesses involved in the prosecution of Lord Edgefield, suspected of blackmailing key security and foreign service personnel, suddenly start lying – including Tara – Steed must discover how they have been got at. Meanwhile, Tara becomes suspicious of DreemyKreem Dairies, but discovers she is literally incapable of telling anyone.
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Teleplay by Jeremy Burnham
Directed by Charles Crichton
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Guest Starring: John Bennett, Barry Warren, Tony Steedman, Simon Lack, Arthur Pentelow, Jimmy Gardner, Rio Fanning