In the final part of our series exploring aspects of Offa's Dyke, and Offa's Dyke Path, Rosa Hunt walks a part of the way in the company of five people with a passion for the outdoors, and asks the theological conundrum of whether God is a walker? There are many suggestions in both the Old Testament and the New that God does indeed walk, and it's possible - some argue - that we come nearest to Him not when we rush around but when we walk at a moderate pace. Even for people without a formal faith, the meditative action of walking can lead to a deep spiritual experience, regardless of whether or not they believe in a creator God.

For Steven Carter, a retired Baptist minister, walking Offa's Dyke has a particular significance - despite his cancer prognosis, he is determined to walk as much of its 177 miles as possible in easy stages. In this programme Rosa joins him for a section of the Dyke at Hergest Ridge. For Llinos Metcalf easy stages are probably not what she is seeking, since over the last ten years she's signed up for and completed numerous arduous treks in places such as Patagonia, the Sahara and the Arctic, sustained by her faith and a mission to raise money for Velindre cancer hospital. Rosa takes a detour to Newchurch, near Gladestry, to speak to Ann Dean about the diaries of Francis Kilvert, the one-time curate of Clyro who was an avid walker in the district. Near Hay Bluff Rosa encounters Susan Langford-Johnson, a former Catholic chaplain who despite no longer believing in God, believes she has had a deeply spiritual experience whilst walking a pilgrimage. Finally, on a gentle stretch of Offa's Dyke path at Hay Rosa meets Rev'd Dr Mark Clavier, who has written about his own 'pilgrimage' whilst never having been on a 'proper' one to a religious shrine. Is God a walker? "Yes", he agrees, "God must certainly be a walker...or else a sadist!"