Lake Vyrnwy and Tredegar

Week three and Derek visits two places which were shaped by the Industrial Revolution. In Powys, he's at the beautiful Lake Vyrnwy with fellow weather presenter Sian Lloyd. They'll learn about the village that was flooded to make way for the reservoir which still supplies Liverpool with water, and marvel at the famous dam, a Victorian Engineering feat. In Tredegar, Derek's on a trail back in time, discovering the rich history of this unique valleys town. He'll visit the largest lump of coal in the world, learn about a scheme that inspired the creation of the NHS and view the impressive remains of Sirhowy Ironwork furnaces.