I completely forgot to respond to this somehow! As far as I can tell, the landaulette thing wasn’t actually a pun in the text of the original short story - Bertie just spaced out and imagined he was at a lecture, and the mangaka decided the “lecture” would be a women’s suffrage rally.
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(And I know it’s been an awfully long time since we put this chapter out, but we might take you up on the proofreader offer in future if it’s still available! I kind of fell off Please, Jeeves due to various life and health circumstances, but after putting out one more chapter of a different manga I hope to get back into it.)