Programme One introduces us to our presenter Colin Stafford-Johnson and to his journey. Opening with early morning mist rising off the river, viewers will be transported to a world few ever see. Close-ups of riverside wildflowers revealing the minutiae of river life give way to massive aerial shots of the river as it flows to the sea. Colin offers thoughtful reflections from inside his canoe or by the light of his campfire. A kaleidoscope of colour and action crosses the screen with giant butterflies and dragonflies powering up and taking off in slow motion. Kingfishers are filmed crashing into the river on their relentless hunt for fish while the Daubenton’s Bat is filmed at night scooping insects from the water’s surface.

Colin Stafford-Johnson concludes his exploration at the source of the mighty river, where he observes migrant whooper swans, great crested grebes, cormorants and starlings at dusk.