The Indiana Jones of the botanical world recounts his quest to find and save Rafflesia, the world's largest flowers, from extinction.  Talking to writer, photographer and broadcaster Robert Penn, botanist Chris Thorogood offers a fantastic glimpse into the world of extreme fieldwork, with local guides and foresters, braving leeches, kidnap, monitor lizards and lethal forest swamps.  Finding Rafflesia completes Thorogood's childhood ambition with these plants.  From the age of eight he was growing vines up his curtain pole.  Today that boy is a world specialist on parasitic plants, Deputy Director of Science at the Oxford Botanic Gardens and a regular panallist on Gardener's Question Time.