This is the bonus cache for our Woodbury Castle Adventure Lab.
As you complete the stages of the Ad lab, values for A - E will appear in the journals.
The cache is hidden on Castle Lane, just outside of the SSSI, at:
N 50 40.ABC W003 22.DBE
There is a footpath leading from the parking area of the Adventure Lab (listed coordinates above) if you would like a walk in the area below the castle, but there is also room for a car to pull in briefly at the end of the footpath with a short walk to the cache location.