start at drain cover at picket twenty road just off roundabout. turn left and proceed to entry left to join a303(t) andover bypass eastbound carriageway (gr385450). travel eastbound on a303(t) for approx 6 miles where take slip road at bullington cross (a34 northbound/southbound). at roundabout stay in left hand lane to take 1st exist and follow road under a34 and a303(t) to turn left at next junction and rejoin a303(t) in westbound direction. retrace westbound along a303(t) to finish at lay-by 10 mile point, approx 1 mile before slip road onto a3093 (riders not to stop at finish but continue riding and leave a303(t) at a3093 exit).