John barges his way across Scotland along perhaps the most dramatic and scenic canal in Britain - the Caledonian Canal. The canal links together three natural lochs, each a vast expanse of water as it makes its way right across Scotland from coast to coast. Along the way he searches for Nessie the monster, learns how to tackle arguably the highland's real monster - the humble rhododendron - and, much to his delight, enjoys a stop at the occasional whiskey distillery.