This is the bonus from completing the Adventure Lab Cache, Milton Keynes Magical Adventure.
This can be found here: (You need the Adventure Lab app to complete it)
https://labs.geocaching.com/goto/MKMagicalAdventure
The cache is not hidden at the co-ords. There is parking nearby. Be aware that the parking may be busy on a Sunday due to the local church.
The co-ords may be slightly out due to tree cover, but look around and you will see something not from the muggle world!!
Please replace as you found it as we don't want it to be muggled.... Thanks!