TUMBLE - Start at telephone pole opposite junction with B4246 and Unclassified road to Govilon. Proceed uphill on B4246 beyond cattle grid (CARE) (1.85 miles) to continue climbing beyond Pen-Ffordd-Goch pond Car Park (The Keepers pond) to FINISH at ‘Y Tymble 514 m’ post on road 5 yds north of minor road junction from the east (2.64 miles)