If I’m not out walking myself, I’ll be listening to Sound Walk on Radio 3 from 2pm today. If I am, I’ll catch up later. Over four hours, Horatio Clare (whose books include the Stanford Dolman Prize winner Down to the Sea in Ships) will be making what the BBC calls “an immersive, slow-radio experience of a 10-mile walk along Offa’s Dyke”. Along the way, there’ll be Welsh music, the ambient sounds of the landscape, and contributions from the poet Christopher Meredith, the artist Susan Milne, the folk singer Sam Lee and the novelist Tom Bullough.