Act 2
Ko-Ko (out of picture): I've just ascertained that, by the Mikado's law, when a married man is beheaded his wife is buried alive.
Nanki-Poo & Yum-Yum: Buried alive!
Ko-Ko (out of picture): Buried alive. It's a most unpleasant death.
Nanki-Poo: But whom did you get that from?
Ko-Ko (out of picture): Oh, from Pooh-Bah. He's my Solicitor.

Nanki-Poo (Keith Bulley) and Yum-Yum (Anne Pearson) - picture from Keith Bulley