skygiants

oh man, and then Peter could have been their king and his code name would have been Tybalt and he could have gallivanted around England wearing cat ears and a swishy cape

Harriet would have just gotten acclimated to the whole peerage thing, too: it's one thing to marry the brother of the Duke of Denver, it's very much another to inherit Denver and what do you mean, you're the King of the Cats? ("It was right there on the family crest: 'Sable, 3 mice courant, argent; crest, a domestic cat couched as to spring, proper' . . .") There would need to be a second round of complex conversations involving Latin.

[edit] I am getting the picture that Sayers thoroughly missed the boat by giving the Wimseys that coat of arms and then not making them were-cats.