This is one of my favourite caches of the series so sit down and have a rest and enjoy the view.
Consider: Pen-y-Ghent = ABCDE
Cache can be found at:
N51 20. (A+E) (A-E) (A+D)
E000 14. D (A+D) (A-E-B)
You can check your answer at:
Cache is a double sized film pot