In the last 70 years, Wales has changed more rapidly than ever. In this final episode, a Welshman battles to set up Britain's most cherished institution, the British parliament votes to drown a Welsh valley, a new generation of sporting heroes sets the flags waving, and television itself becomes part of the story of Wales. We're a nation of commuters and consumers, but our sense of history has revived: we are a people with a story - and that story gives us power.