Derek's back! With 8 more incredible walks around Wales. He's on ranger duties at a country estate in Carmarthenshire, exploring Dinefwr Park's 800 acres of magical medieval landscape and getting up close and personal with a very rare cattle breed! In the Vale of Glamorgan, Derek's joined by one of the nation's favourite Olympians, Colin Jackson. Together they're exploring a 5 mile coastal route that has it all...Dinosaur footprints, WW2 gun battery remains, the site of a major communication breakthrough AND an iconic Victorian pier.

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.