>>>Miss Lynn Mayminster, Countess Macross - Daughter and only
>>>child of the late John Wallingford Mayminster, 4th Earl of Macross
>>
>>You said Viscount last time. Did he get promoted for something?
>
>... discovering the Macross, perhaps?

I was wondering about that. Thing is, that makes him the 1st Earl of Macross.

>Anyway, this is good to know (though it does not agree in all particulars with
>my primary reference; then again, my primary reference is a web page about
>Jane Austen novels :)

Fictional references tend to have somewhat dubious accuracy here, and it's complicated by the fact that the rules of British aristocratic styling are insanely intricate (especially when dealing with girls who inherit). "The" reference on the subject is Black's "Titles and forms of address: a guide to correct use" - available from amazon, although modern editions may not be entirely correct for the historical usage, things changed around a lot in the 1960s when the upper house was redesigned for political reasons.

For an online source, I believe this page is an accurate reproduction of the basic forms: http://www.chinet.com/~laura/html/titles12.html