Derek is back with eight more incredible walks around Wales. In this edition, he is on ranger duties at a country estate in Carmarthenshire, exploring Dinefwr Park's 800 acres of magical medieval landscape and getting close to a very rare cattle breed. In the Vale of Glamorgan, Derek is joined by Olympian Colin Jackson. Together they explore a five-mile coastal route that has it all - dinosaur footprints, WWII gun battery remains, the site of a major communication breakthrough and an iconic Victorian pier.

In this edition, Derek visits two places which were shaped by the Industrial Revolution. In Powys, he is at the beautiful Lake Vyrnwy with fellow weather presenter Sian Lloyd. They 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 goes on a trail back in time, discovering the rich history of this unique valleys town. He visits the largest lump of coal in the world, learns about a scheme that inspired the creation of the NHS and views the impressive remains of Sirhowy ironwork furnaces.

In the last episode in the series, Derek is joined by two guides who have both used walking to assist them on their very different but personal journeys. Musician Jules Peters takes Derek on her favourite walk in Wales, a stunning section of the Llyn coastal path which ends at a famous beach bar. Jules explains how walking every day helped her to cope with her breast cancer treatment. On the Welsh border in Presteigne, Derek is with a man who walked the entire 1,100-mile perimeter of Wales to raise awareness and funds for Alzheimer's. Tom Davies takes Derek on a small section of his Welsh wander which includes the Offa's Dyke path.