Doesn't it stuck out a mile that they are fakes? I don't mean that Lady Blarney is not a ladyship or that Miss Skeggs not Wilhelmina at all. But their "high-lived dialogues" leave no doubt that at best they hold to the skirts of some follower of some distant acquaintance of some noble family. "I believe that her Grace would keep nothing a secret from me", forsooth! Mr Burchell may or may not have a reason for his "Fudge!" exclamation, but the reader is left in no doubt that the good ladies just throw about any names (and titles) that come to their heads. What a contrast with the next part of the dialogue - speaking about companions - the dear ladies become very specific indeed. Well, whatever are his characters, Goldsmith wasn't a fool. :)