As I'm sure you've already worked out, the cache is not at the given co-ordinates.
It's at a spot on a walking/running route of mine that always feels like the middle of nowhere..!
Answer three easy 'crossword' style questions to get three words. Use what3words to find GZ. Simple..!
Q1 - Swelling; lump; protuberance; Battle of the .....
Q2 - Closely mown area from tee to green on golf course
Q3 - Thin slices of meat, especially veal, or the vegan option, nut .......
The Geochecker is really just for back up, as the what3words square zoomed out in satellite mode, along with a good old OS Explorer map or app should guide you in..!
The w3w app is better than the website as it shows the co-ords onscreen. Change w3w display settings to degrees, decimal minutes and use co-ords to three decimal places to get the nod from the Geochecker.
GZ is on a footpath and can be reached from various places in various directions. With a bit of planning, you can make it a nice loop walk, or even a point to point if you can work out the logistics.
You're looking for a 5" long tube wrapped in black tape