22 writers talk about their memorable excursions and the act of walking, and share their creative observationsIn these six series, taken from BBC Radio 3's The Essay, an array of novelists, poets, journalists and biographers chart the varied and inspiring walks they have taken around Britain and elsewhere. Here are treks taken at daybreak and after dark; in winter and in spring; in the footsteps of the past; and - in the case of Robert Macfarlane - along t...