The cache can be found at:
N50 Sourcery Wyrd Sisters . Moving Pictures Guards! Guards! Mort
E000 The Sea and the Fishes . Troll Bridge The Light Fantastic
Good luck!
The cache is placed in accordance to the GAGB's landowner agreement with the Forestry Commission East England Forest District. 'The landowner (Forestry Commission East England) does not assess the suitability or safety of the cache location. The cache placer and the cache finder have a responsibility to take reasonable precautions to protect their own safety and the safety of others. Hazards observed at or on route to the cache location should be reported to the cache placer’
You can validate your puzzle solution with certitude.