Ask most people whether they fancy a four-month, 5,000-mile trek across the Middle East and they might conclude you need your head seen to. With civil war raging in Syria, Iraq mired in internecine conflict while mopping up the remnants of Daesh, al-Qa’eda running amok in southern Yemen and simmering strife between Israelis and Palestinians, walking across 13 countries might not seem like an obvious itinerary.