Guy de la Bedoyere is a popular historian who has written a number of works on Roman Britain, including a recent hardcover survey (Roman Britain: A New History), a history and walking guide to Hadrian's Wall, and The English Heritage Book of Roman Towns in Britain. Another of his books, Defying Rome: The Rebels of Roman Britain, is currently being offered in hardcover at a good sale price by The David Brown Book Company: normally $50 in hardcover, they're offering it for $15. Compare Amazon.com, where the book is $35 in hardcover and $25 in paperback. Here is the Amazon.com entry with a good pair of reviews.