An incredible voyage of discovery from the frozen summit of Ben Nevis to the white sands of the Isle of Scilly; and from the rain-drenched tip of western Ireland to the dry expanses of East Anglia. Alan descends a Yorkshire waterfall twice as tall as Niagara Falls, climbs one of the highest mountains in Scotland, forages with red squirrels in Formby, takes a trip back in time to find hippos roaming Trafalgar Square, a huge forest from Land's End to John O'Groats and prehistoric reptiles paddling Britain's tropical seas. Here is the evolution of the British landscape and wildlife through dramataic geological, cliatic and human change, and an examination of the land today with fresh challenges and responsibilities for us to face.