Look out for a rather peculiar sign indicating a "Private Public Footpath" as the Hangars Way path joins a gravel track (see waypoint below)(may now have been removed and the drive is now tramac - May 2020)
You are looking for small cylinder with some black duck tape camouflage.
Dont forget to note down the letter and number combination from the cache so you can find the bonus caches later.
After finding this cache head up the edge of the field toward the foot of the Shoulder of Mutton Hill