No guesses yet, so a couple of clues along with a slightly de-cropped pic. This structure is situated within a radius of 200 metres of 3 methods of transport and/or distribution, and although it is pictured from above in this photo is much more noticeable seen from below. I would imagine that most forum members pass within 100 metres of it on a fairly regularly basis, but although it is very visible it's much easier to see if you are travelling one way rather than the other ......