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 middle of winter, with 17 hours of darkness, 500 competitors head north of Inverness for one of the world's toughest mountain bike races, the Strathpuffer 24-hour marathon. And once again, this year conditions are testing - with ice and mud pushing the competitors and their bikes to the very limit.