The cache is not at the listed co-ordinates.
The information you need to find this cache can be found by completing the Painswick's Past Adventure Lab Caches. For this you will need to download the Adventure Lab app and log in using your geocaching credentials. The numbers required can be found in the journals of completed stages.
The final location can be found at:
N51 46.ABB
W002 11.CDE
The cache is a 150ml tube in a camo bag.