Go straight across the road from the visitor centre. Go left and then right across bridge then turn left straight after. Take first right up switchback climb up, with view of visitor centre across the valley to your right. Take first left switchback turn up grassy earth double track possibly muddy middle. After 1.3 miles you will see a loose rocky climb straight ahead. Go up here then turn right at the top with the sheep farm to your left. A long climb leads to a wide junction. Turn left then bear immediately right on to shale road with valley view to your right again.
3.4 miles right turn on to another shale/rock road with rutted bend. Along rocky fire road switch backs at top speed, a final left bend brings a spectacular view of the valley again on your right.
Take right turn on to single track soon after (marked with a wooden post with a black footprint sign (it is ok to ride down this, try to stay of paths marked with a red cycle crossed out) Follow single track down and around right hairpin (steep) then along possibly boggy section to junction with wide trail at the bottom. Continue (right) along shale road.
5.3 miles look for a narrow single track back fork to the left (currently fly tipped!) about 200 yards up this climb. This goes down through the young tree growth then hairpins right and shortly after turns left and splits (take your pick) to drop on to flat area. Go over the metal double gate along earth double track following the river valley. This turns in to a narrow sheep track (aren't sheep brilliant?) over rock steps then after several hundred yards goes right through a single gate. turn left on to old railway double track (view of houses across valley to your left) after passing between the columns of a collapsed stone bridge turn left on trail marked with three posts (one bears a green 3K marker) bear right on narrow double track following the course of the river to your left. Joins another trail at blue arrow post, turn left here and go back across the wooden bridge over the river. The trail leads up under the road bridge (currently under repair) go under here and turn right. As you begin this climb look on the hillside to your left, you'll see a single track which will be the finish of the ride. Continue up this climb to
9.56 miles this long winding climb leads to a large crossroads. Turn left here and follow up on to the moor top. 
10.3 miles forest road bends left go right along a narrow straight trail across the open moor. This 400 yard trail leads out on to another forest road. Go straight on here, heading for the line of trees. Just before the line of trees turn right down double track descent. This turns left and joins another fire road at the bottom. Bear left and follow round left sweeping turn.
11.6 miles At crossroads continue straight on, then the road descends and the main trail goes left at the bottom. Turn right on to a minor trail across felled area here. This narrows and turns right after a few yards then climbs a short pitch before descending for 300 yards to a set of switchbacks on your left. Go down here and drop down final steep pitch on to a farm road. Turn right and go approx 150 yards looking out for a narrow singletrack left turn which goes down 10 yards then over a ride-able gap in the collapsed stone wall. This turns immediately right then between trees and up a very short pitch to drop steeply down to a narrow bridge. Cross (yes it is ride-able!) and follow the superb single track down this small valley, over bumps on open grassland and finally on to a double track descent which opens on to a wide forest road. 
13.2 miles. Turn right here and follow wide open forest road for 0.6 miles to a right fork up a steeper forest road (sorry!) ride up here for 0.4 miles where you will see a well defined single track descent to the left. 
Go down this, over the gap in the wall (ride-able) and drop down on to another forest road. Turn right here and follow the forest road to a steep rocky double track to the left. Soon after this levels out (about 300 yards) look for a single track which drops steeply off the left hand side of the trail. This is a very steep single track not for beginners, if you're not good at the steep stuff get off and walk! Follow this down to a concrete ford, cross here and walk up the no cycling switchback to the main trail (this is part of the climb from the visitor centre) Turn right up the hill here for 200 yards to a left 'u' turn up a single track, look for single track on left 200 yards up here, follow this back to main trail then turn right and bear left along main trail past bridge and back to visitor centre.