START (GR163538) on B1043, 250 yards south of Station Rd., Tempsford; 26yards south of lamp-post B9 and 38 yards north of 1st. drain south of lamp-post B9. Proceed south, straight on at 1st. RAB to join A1 (CARE) and continue over Sandy, North Biggleswade (Warden Lane) and South Biggleswade RABs to:- TURN (12.51 miles) by bearing left onto slip road at commencement of A1(M) approx. 2miles north of Baldock. Encircle RAB beneath motorway (junction with A507) and up slip road to rejoin A1 northbound carriageway. Retrace outward route over all RABs to:- FINISH (GR162537) on A1, approx 500 yards north of Tempsford Village Hall and 200yards south of footbridge over A1, at the railings on south side of entry to Anglia Water building. Police Area(s) Bedfordshire