The founder of architectural practice Flannery & de la Pole, author Julian Flannery has always been fascinated by historic buildings. His architect’s training affords him special insight, and in addition to English medieval parish churches, he has made a close study of Hampton Court Palace and was involved in its restoration in 1986. His book 'Fifty English Steeples' is testament to a lifelong passion: here he talks about the lure of architectural drawing, Victorian restorations and the beauty of the medieval landscape