There is nothing to find at the posted co-ordinates.
This cache can only be completed by travelling around the Congresbury Charms Adventure Lab. At each of the five locations you will be given a bonus letter / number which you will need to transpose into the following co-ordinates to calculate where you will be able to find the cache.
N51 22.AAE W002 48.(C-D)(B+D)(B+C)
Final location (and formula) amended 20/10/22 due to original cache going missing 3 times.