<p>Patronising advice by a doctor at a retirement course to 'walk a couple of miles a day' challenges architect Sean Rothery to take a proper walk and so, at the age of sixty-five, he sets out to walk the GR5, the Grande Randonée Cinq. From the steely grey North Sea to the intense blue Mediterranean, Sean's 2,300km-long route follows a network of old trails, forest paths, canal banks, Alpine valleys and passes. Along the way, he recounts some of ...