From the M5 / A361 (avoiding Barnstaple):
From the M5 take the A361 signposted to Barnstaple at Exit 27. Turn onto the A399 (signposted Ilfracombe Holiday Route - Brayford and Blackmoor Gate) at the second South Molton roundabout. Turn left at the Bratton Flemming turning approx 1-2 mile after Brayford. Follow this road for 2 miles and when you enter Bratton Flemming turn left and follow the road to Barnstaple. 2 miles after leaving Bratton Flemming take the right turn signposted to Loxhore. After 1/2 mile take the right turn to Lower Loxhore. Keep following this road until you pass a telephone box and chapel on your left. 20m in front of you will be a wall with a notice board and post box - turn right here and the Roundhouse is straight in front of you.
From Lynton (A39 Coast Road):
Follow the A39 to Blackmoor Gate and then take the left hand turn onto the A399. In approx 200 yards turn right onto a small road signposted to Arlington and Loxhore. Follow this road for about 3 miles until you see a telephone box - turn left here and 200m later take the first right turning. (signposted to Lower Loxhore). Follow this road for 1/2 mile. The Roundhouse is on the left by the village notice board and the post box (20m before reaching the chapel and phone box).
Link to map of North Devon (google maps)