Got this from Rich Betts...
5. Tom Riach. Fallen trees and logs to negotiate, tracks leading off in random directions to sandbag you. No one finds it first time. A bit spooky too.
4. Ruthven Boulder. Always further than it looks but not far enough to be bothered with walking boots or wellies, which is usually a mistake. One or two technical muddy sections to cross. A real tester.
3. Brin. You just know theres going to be a bull in that field one day and due to the curvature of the earth you wont see it until you are right in the middle.
2. Anything up the hill at Brin. Bottomless crevasses, weird animals, no paths, everytime you go there the boulders have been moved around.
1. Duntelchaig backside. (knife wound / the dagger) A classic stamina test. This one has everything, no path, deep heather, bracken, boggy, an underground stream. No view of the crag until you get there, so you cant check if its wet until its too late. Just as bad in reverse too. Epic.