Starting on Aberdeen's beach and finishing in the wild lands of Knoydart in the west, Cameron McNeish travels through Scotland's most spectacular glens and mountains following a new route that proves that Scotland has some of the most outstanding landscapes in the world.

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 as we follow the hardiest of competitors - the solo riders.