376725 Start on the B4000, at the junction of the Wickfield Road, ½ mile east of Shefford Woodlands. 0.000 448681 Proceed south-eastwards on the B4000 to the roundabout at the junction with the A4 5.400 388719 Circle the roundabout (M1, 2, 3) to retrace on the B4000 to a point at the east edge of a field gateway, 452 yards short of the M4 bridge where finish. 10.000