The cache is not at the headline coordinates. This is a bonus cache for those doing the Adventure Lab "Bedfordshire's Alien Landscape" which is a circular walk of about 3 miles, taking you on a tour of the mysterious landscape in this part of Bedfordshire, surely created by aliens.
Whilst completing the Adventure Lab, you will pick up information to complete the co-ordinates below and find this bonus cache as part of the walk.
The cache is at N52 07.ABC W000 14.DEF.
The walk contains some steep ups and downs in places but no scrambling is required. The Adventure Lab locations cannot always be reached by going in a straight line but the paths you need to take are fairly obvious. Please don't cross any fences and be aware of the safety notices. At one point you cross a road which might have lorries going up and down so please take care here.
Enjoy the walk!