Stilton Cheesewright says that he's surprised at the lax way the Prohibition Laws are enforced in New York. Prohibition ran from the passing of the 18th Amendment in January, 1919 until it was repealed by the 21st Amendment in December, 1933.
However, during the July 4th Costume Ball at the Empire State Building, the band plays the song, Anything Goes by Cole Porter. This song was released in November, 1934; the earliest this Costume Ball could be is July, 1935, which is well after the repeal of Prohibition.
Wooster: Georgie, I'm engaged to Florence again.
George: Oh, well, congratulations. That's a bit sudden, isn't it?
Wooster: Yes, well, Florence is like a volcano; you can go around thinking it's been extinct for centuries, and suddenly you're covered in red-hot lava.
Adapted from P.G. Wodehouse's "Joy In The Morning".
Also known as "The Once And Future Ex".
Francesca Folan played Madeline Bassett in the 1st series; in the 4th series, she returned as Lady Florence, a part previously filled by Fiona Gillies in episode #16. The guest cast list also includes a credit for choreographer Domini Winter.