“Guardian” staff writer Patrick Barkham chats with Ross MacFarlane about “The Swimmer”, Patrick’s appropriately unconventional biography of Roger Deakin. Abandoning his lucrative career as a 1960s Soho advertising executive, Deakin bought a ruined house in rural Suffolk and then reinvented himself first as a documentary film-maker and finally as the author of the bestselling memoir, “Waterlog”, which sparked both the fashions for nature-writing and so-called wild swimming.