A final, physical cache at the end of the "Crickley's Ancient Past" adventure lab cache.
Once you have solved the five stages of the Adventure Cache "Crickley's Ancient Past", you will have the answers you need to find the final co-ordinates for this cache.
The appropriate Adventure Lab apps can be downloaded from the App Store or from Google Play - visit https://labs.geocaching.com/ - and log in with your Geocaching.com credentials.
Once you have successfully found the five Locations in the Adventure, you'll have the numbers you need to find this final, physical, cache.
N51 50.ABB W002 05.CDE