This is a letterbox hybrid cache that is hidden at the published coordinates.
If you don't understand about Letterbox Hybrid caches then they're quite straightforward - they're the same as a traditional, a multi or a mystery cache, just with a stamp inside. The stamp is used to stamp your own personal logbook if you do letterboxing. All you have to do to claim this as found is sign the logbook, same as any other physical cache.
I noticed there weren't many caches around the Whiteley area so decided to set some for people to find. A mix of hides but all relatively straightforward.
Be aware that these paths can be quite busy at times, so try not to be too obvious, and please hide the cache well once you've found it and signed the logbook.