Start on the A4, approximately 2.5 miles west of M4 junction 12, at the eastern end of a long lay-by on the South side of the road approximately 300 yards west of the junction of the Sulhamstead Road with the A4 (Spring Inn) adjacent to lamp post 47. 0.000 SU620694 Go west along the A4. Go straight across the roundabout at the junction with the A340 1.65 miles SU603676 Continue through Woolhampton to the Kennet Park roundabout (Turn) 5.65 miles SU541668 Circle the roundabout and retrace along the A4 to go straight across the A4/A340 junction (care, traffic from the right) to a short dual carriageway and on to the large roundabout at the junction with the A340. (Pangbourne Lane) (Turn) 12.5 miles SU632706. Circle the roundabout and take the fifth exit to retrace along the A4 westwards, continue through the start point, go straight across the Aldermaston roundabout at the A4/A340 junction 15.17 miles SU603676 Continue westwards through Woolhampton to the Kennet Park roundabout (Turn) 19.3 miles SU541668 Circle the roundabout, and retrace along the A4 Eastbound through Woolhampton to go straight across the Aldermaston roundabout at the A4/A340 junction into the short dual carriageway. Continue past the dual carriageway to finish on the north side of the A4 immediately opposite the start and lamp post 47 25.030 miles SU620694