This is the bonus cache for the Adventure Lab - Superman IV: The Quest for Milton Keynes, which details the locations used in that film to try and pretend to make MK into NY City!
https://adventurelab.page.link/WGaZ
The cache is not at these co-ordinates, but can be found using the bonus codes in the journal of the lab cache by following this simple equation:
N52 02.ABC W000 45.DBE
Please be VERY discrete at GZ - especially during office hours as it seems that smokers like to hang around in sight of here, might be time to check your shoelaces!