After number six the route interacts a bit with two other series so there is a bit of a gap.
You need to find a footpath by the sub station on the right hand side of the road then head over the stile and up the side of a field going due north.
Once up the hill head towards the trees and through two stiles onto the lovely named Long Tongue Scrog Lane. Alternatively just keep walking along the road and double back where the lane starts.
Keep an eye for a well hidden path to the left (Waypoint 1) and then follow the arrow to the cache location. Climbing on one of the handy concrete blocks might help