Slightly unusual cache in easy to reach location.
One of a series of 'hidden in plain sight' caches - hopefully should be too hard to find. You'll need tweezers to access the log book and a pen if you want to sign it.
Nearby Fen Drayton has a long history of market gardening as the Land Settlement Association acquired a large area of local land in the 1930s. This land was divided up into 50 plots which were given over to unemployed workers from depressed industrial areas of Britain. From this, a community of cooperative market gardeners was created and the glasshouses are a remnant of the time. The brick building in the field is an old pump house.