In this ratings busting special, Alan Titchmarsh joins HRH to talk about his life, passions and work. His conversations with The Duke and his visit behind the scenes at one of the Royal Estates combines with fantastic personal archive footage, some shot by Prince Philip himself, to paint a revealing portrait of The Duke at 90. As The Duke talks candidly about his many achievements, the programme discovers that for half a century he has had a rare perspective of British culture and industry.