Two's Company - Series 3 - Episode 3 - The Pet - Beryl Reid

[@Tesserae]

Connie Sachs from MI6 working undercover.

[@OldTVFromThePast]

You are correct, she was in Tinker, Taylor, Soldier, Spy.

[@Tesserae]

@ in Smiley’s People she retired to a farm that raised dogs.