Goldfinger/Honor Blackman in-joke by Steed
I was just watching "Too Many Christmas Trees" from 1965 (season 4). Mrs. Peel was handing Steed some Christmas cards he had gotten in the mail, commenting on the number of them from women. To paraphrase the conversation:
Mrs. Peel reading the cards: Best wishes for the future... from Cathy.
Steed: Oh, Mrs. Gail. How nice of her to remember me.
*he looks at the return address on the envelope*
Steed: Hmmm....What's she's doing in Fort Knox?
LOL!!
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I'm just a patsy!