Cameron McNeish celebrates Scotland's landscape, following a new national trail linking Kirk Yetholm in the Borders with Cape Wrath, the most north-westerly point on the mainland.In the first of two programmes, Cameron walks the southern half of this 470-mile trail, travelling through the rolling hills of the Borders, visiting Edinburgh and entering Scotland's first national park. It is a journey he describes as 'one of the great long distance trails of the world.'.