The cache is not at the listed coordinates, to find the cache you will need to complete "A Walk Around The Pantiles" Adventure Lab. Each location in the adventure has an additional question, collect the letters and numbers and enter them in the formula below.
This listed coordinates will take you to The Forum - which opened as a new music venue in January 1993 in a building on Tunbridge Wells Common which had been built as a public cold bath and was subsequently a public toilet and then a brass rubbing centre. It has since hosted a number of acts who have gone on to achieve significant commercial success.
See The Pantiles website for all information on the location of the Adventure Lab
The final location is a short 2-3 minute walk from the adventure lab location.
Cache can be found at:
N51 7. (C) (A) (E-B)
E000 15. (B) (E-C-D) (D)
You are looking for a magnetic container.
This is my first adventure lab and bonus so thanks for taking the time to check it out 