start on b1230 in gilberdyke 5 miles east of howden ti at a point approx. 110 yards east of gilberdyke service station at painted mark at end of lane. proceed westwards on b1230 to turn at howden ti. retrace through gilberdyke to finish at tp 107/31-60 15 yards past car park entrance to white horse inn (gilberdyke).