Peter Rabbit is 100 years old this month, and during his lifetime the best-selling blue-coated bunny has never been out of print. Libby Purves visits some of the environments associated with his creator in London and the Lake District. With contributions from Beatrix Potter 's biographer Judy Taylor , James MacKay of the Friends of Brompton Cemetery, and Willow Taylor , who grew up living next door to the author. Producer Tim Heffer