Gather 6 numbers from other caches on the Dingestow Butterfly loop to find this cache, which is hidden in an area where White Admirals were seen in the 1990s and where the lucky observer might still see Silver-washed Fritillaries in the height of summer.
It’s a bit of a walk, and is separate from the main loop so parking is suggested in the checker, but there’s a locally made reward for the First to Find!
Obviously the cache isn't on the A40, as even an ammo case wouldn't last long on there. To find it use the numbers you collected in my caches organised in a butterfly shape around Dingestow and this formula N51 A.BC W002 D.EF.
You can validate your puzzle solution with certitude.
I have written a PDF guide to the Dingestow Butterfly cache Series that might be useful for people working out which puzzles to prioritise. I promise it doesn't contain any Hints though.
https://drive.google.com/file/d/1eCgwQKhpjCcAXxTjjhAUnEFyospeDkON/view?usp=sharing