start at clearway sign to betteshanger (tr308529). proceed west to join a.256. proceed via tilmanstone roundabout (1.563 miles) to turn at a2 north feeder roundabout (5.546 miles). retrace a.256 to tilmanstone roundabout (9.464 miles). proceed straight on to finish at 11th drain south of foot bridge over a.256. a double drain counts as one. (tr 306513).