This cache is not at the co-ordinates you can see here.
To get the final location you will need to solve the nearby Adlab.
See link below.
https://adventurelab.page.link/YAS6
Once completed, you should have what you need for this....
N51° 47.ABC W003° 04.DE(A-E)
Plus enjoy the stunning views! I will appricate any amazing photos you have of this place!
And cheer on the mermaids...
Cache placed with the kind permission of South East Wales Hang Gliding & Paragliding Club