Amanda Foreman's "Georgiana - The Duchess of Devonshire" (biography)
Read this about a year ago, after getting back into reading Regency and historical romance. An amazing book - extremely detailed (and some tough slogging) but the insight it gives into the *real* lives and thoughts of English aristocrats and politicians of the time (late Georgian, early Regency) is invaluable for anyone who enjoys reading about the period and wants to know how things were in reality.
