An unidentified aerial phenomenon - just visible at the upper-centre point of the photo - caught hovering above Horsingdon Wood. There is a long history of sightings of UAP over the region.
Whilst speculation abounds, there has never been any explanation (at least not one that has been made public - and if the Ministry know differently, they certainly aren't telling) as to the source of these phenomena; nor have any answers been forthcoming as to why, if there is some kind of sentience or agency directing these craft (if that is indeed what they are), it is taking an interest in the locale.
In all likelihood, such secrets will remain forever undisclosed. And perhaps this is for the best - for if answers to these questions were ever to be revealed, it is doubtful that we would find them palatable.