A special documentary to mark the seventieth birthday of HRH the Prince of Wales. For this observational documentary, film-maker John Bridcut has had exclusive access to the prince over the past 12 months, both at work and behind the scenes, at home and abroad. He speaks to those who know him best, including HRH the Duchess of Cornwall and the Dukes of Cambridge and Sussex. His sons discuss their upbringing and their feelings about the prince's working life.