The Cateran Yomp is the biggest, toughest charity event of its kind. This year, more than one thousand Yompers will gather on the edge of Blairgowrie in the heart of Scotland to traverse through the foothills of the Cairngorm mountains, walking continuously for 54, 36 or 22 miles over 24 hours and raising hundreds of thousands of pounds for the Army Benevolent Fund.