Ahhh now then, I've seen some recent local Puzzles and thought I'd have a go myself. It's been a while since I published a cache, so here goes.
The geocache is NOT at the published co-ordinates, you'll need to solve the puzzle and satisfy certitude before being handed the cache co-ords and hint. There is short term parking for one vehicle at GZ, caching by cycle would be ideal.
Just do what the image below asks.
Once you've figured out the answer, enter the digits into Certitude and you'll receive the co-ords and a nice hint.
You can validate your puzzle solution with certitude.