From A30 leave at Sourton services Interchange and take the A386
Prewley water treatment works access is 300 meters South of the slip
road, the second on the left.
Walk in a South Easterly direction, avoiding the
bogs and wet ground.
Maintain your height after leaving the wall and cross the valley near
the top to reduce your climb around the rim of the bowl.
This is a long walk up to take off, approximately