I spent a lot of my reading time in the Regency period this last month, including this month's book. The book comes from an author I have read before, Georgette Heyer. A girl I work with suggested this book, knowing that I had enjoyed other books by Heyer.
Heyer basically created the genre of historical romance, but her books aren't heaving bosoms or shirtless men. Instead, they are exactly true to to period. In fact, Heyer became known as an expert on the Regency period, including a lot of information. Sometimes there is a bit too much information in some of her books, but the book I'm recommending, Arabella, is just right.
Arabella follows the oldest daughter of a Yorkshire vicar to London for her season, but on the way there, her impetuous nature causes her to make an influential man think she is someone more important than she is. Now all of London believes she's a rich heiress, which could get in the way of finding a good match.
This book, like my other favorite of Heyer's, Regency Buck, is very fun, with dry English humor. I wouldn't say that people who like Jane Austen would like this, because the style is very different, but I would definitely recommend giving Heyer a go, especially if you enjoy historical fiction.