The Prince of Wales takes Alan Titchmarsh on a tour of Highgrove House - his own personal retreat and family home. Prince Charles gives a remarkably informal and candid interview about the outlet for his gardening aspirations, offering a rare insight into a royal passion. The Highgrove estate has become synonymous with all things organic, and Alan finds out from Head Gardener Debs Goodenough and her team what inspired the beliefs of the most hands-on royal gardener in history.