This cache is not at the listed location, which was chosen completely at random.
To reach the co-ordinates for this cache you need to complete the Haunted Milton Keynes Adventure Lab cache series. You need to use the Adventure Lab App on a phone and visit the 5 stages answering questions. Each correct answer at each stage gives you a find and will increase the number of lab caches you have found each time.
Once the trail is completed, in the app, select "View Journal Entries" and scroll to the final (5th) entry to receive the final co-ordinates for this puzzle.
Good luck. I dare you to find the Adventure Lab caches at night!
Here's the link to the Adventure Lab: https://labs.geocaching.com/goto/HauntedMK
Note: You will need to have the Adventure Lab app installed to complete it.