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A 2ml tube
Approximately 5.5 miles which should take between two and two and a half hours.
Caches are all smallish and should be easy to find.
Parking is available in Bourn village and the walk brings you back to the village so it's ideal.
The walk is mostly on footpaths, byways and permissive paths but can get muddy in parts and there's about 500 yards along the road (with footpath) between caches #7 and #9. There are no livestock on route.