START (GR322603) on old A428 (Saint Neots Road(, east of Cambourne flyover, about 350yds east of RAB (on north side of DC Flyover), at 12th drain east of double gates, entrance to Water Tower. Proceed westwards on old A428 to RAB where 1st exit onto A428 eastbound, about 1 mile after Hardwick flyover bear left onto A1303, signed Cambridge, pass over A428 to TURN (5.05 mls.) at Madingley RAB. Retrace on A428 westbound to leave A428 at Cambourne flyover. At top of slip road take 1st exit towards Cambourne to:- FINISH (GR318601) about 170yds after leaving A428 slip rd.; just past private lane, Crowdene, and 6yds past grey Cambourne sign and 30yds before (i.e north of) lamppost 35. Police Area(s) Cambridgeshire